Does anyone know the principle of one key and one lock?
It's simple,
First, the manufacturing accuracy of lock cores, marbles and keys, such as the number of steps that can be subdivided in a specified stroke, that is, the difference from the highest tooth bottom to the highest tooth bottom may be 100, and the difference may be 20; No matter how high the accuracy is, it doesn't make sense. The keys of adjacent numbers are open to each other. There is little change in key tooth type (number of teeth), so it is very likely that keys with similar key tooth types will be opened to each other.
If there are two marbles, what is the arrangement and combination? What is the arrangement and combination of three marbles?
Middle school students can count. For example, each bead has 10 height levels, two beads have 100 combinations, and three beads have 1000 combinations.
One structure of those low-end bicycle locks may be hundreds of codes, that is, hundreds of keys; The structure of a high-grade lock can have hundreds of thousands of codes, that is, "numbers". For example, imported locks have high manufacturing accuracy, and each marble can have two layers; Large hollow marbles are covered with small solid marbles, and independent marbles swing by gravity to improve safety performance. Compared with the locks in Europe, America and Israel, the locks in Taiwan Province Province are less accurate.
Some low-gear bicycle locks can be opened by 70% immediately with high-strength keys, which has nothing to do with how many keys are arranged and combined in the lock design. As for the locking hook woven with steel wire, the effective diameter should be quite thick to be reliable. It is dangerous for the effective diameter to be less than 12 mm to 15 mm, and the apparent diameter cannot explain the actual effective diameter.
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Anti-theft doors and windows
We live in a bungalow, and now we want to install anti-theft doors and windows, but I don't know which one is better, stainless steel or aluminum alloy. Please analyze it if you are in trouble, thank you! ! !
If you have money, use hot-rolled solid stainless steel (exclusive, 20 yuan a kilogram) with a diameter greater than 10 mm and an oxide layer on the surface. The layman thinks it is ordinary low carbon steel and does not paint it. With 20 1 brand, the composition can be mixed and mixed, which is more difficult to cut. Mold materials can also be made of high carbon steel and alloy steel bars (there are exclusive stores), and attention should be paid to hardening when supplying. The thickness of the middle and upper and lower gaskets shall be greater than 3mm. Simple, drill a hole in the angle iron and pass through the iron bar. Specifically, it is safe to use an angle iron with a side length of 25 mm or more and a thickness of 2 mm or more as a gasket. Gaskets should be welded with iron bars. If it is high carbon steel, it will be difficult to weld and crack after welding. Unless heated in advance, the upper and lower ends of the steel bar will be lengthened.
The prices of anti-theft doors and windows of stainless steel and aluminum alloy are equivalent to the above standards, while the prices of ordinary low carbon steel are higher and the strength is lower. If you want to do it, you must first ensure that you are practical and secure.
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What equipment should be used for theft prevention?
I have an open-air courtyard with three walls. I want to install anti-theft equipment. No outsiders are allowed in!
I want to install an anti-theft device that can automatically call the police when someone passes by. What equipment should I use?
Buying stainless steel wires with a diameter of more than 0.8 mm is generally common in the specifications of 1 mm and 2 mm.
According to the environment, weave a large mesh to block possible passages.
The maximum aperture of the hole is smaller than the cross section of the human body. The exquisite method is that each intersecting longitude and latitude line is insulated from each other, and it is best to use ceramic mechanical connection and electrical insulation, or to use insulation materials that are resistant to sunlight and ultraviolet radiation and are not easy to age. Then every longitude and latitude line is interpreted by ordinary broken short circuit measuring circuit, which is a reliable anti-theft system and very reliable in the environment of heavy rain and snow hanging! ! ! ! 20 1 brand stainless steel wire will rust about one kilogram in 20 yuan, and 304 brand stainless steel wire will not rust about one kilogram in 40 yuan; Ordinary copper core wire and telephone line are all ok, but the weldability of iron wire is poor, so stainless steel is needed for gas shielded welding. The simplest method is to connect all the longitude and latitude lines in series. In the end, there are only two threads. If they are cut, they will call the police. For the advanced ones, the bridge will be used for balance interpretation, and the local short circuit will also give an alarm. Pay attention to the insulation between the nodes where latitude and longitude intersect, and tie them with insulating materials to prevent thieves from unlocking conveniently. Nail this net to the inner wall, and you can know whether someone is digging holes in the wall from the outside to steal livestock and other property. At this time, thin wires with poor mechanical strength will be used.
Self-made car theft prevention is the most reliable! ! ! ! ! ! ! !
Install alarm fireworks launch device, automatic smoke burning device and self-destruction device! ! ! ! Eject the radio into the air and send out an alarm signal.
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Is there any kind of guardrail that can prevent theft and is allowed to be installed in the property?
In many residential areas in Beijing, for the sake of beauty, it is not allowed to install anti-theft guardrail. At the same time, if the security net is installed outside, it will affect the harmony of the neighborhood and become a tool for thieves to climb! If the old security window can't be opened, and the maintenance of air conditioning is affected, is there a more humanized security window?
The net made of stainless steel wire can be curled and folded. In case of fire, the high-pressure and high-temperature jet generated by initiating explosive device is used to cut the anti-theft net, which is similar to explosive bolts. Or use electromechanical devices to open mechanical locks.
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Excuse me, what is the best intelligent anti-theft lock used on domestic household anti-theft doors without mechanical keyhole?
Design and manufacture by yourself, which is the embodiment of the real national quality, especially in the era when private individuals with ordinary wage levels can do it independently.
There is a keyhole, which provides opportunities for toothpicks, adhesives and others to destroy.
The input board and camera of fingerprint lock have poor damage resistance.
Because I have been laid off and unemployed, I can't guide students to implement it at my own expense. It's not my fault.
Relevant substantive information has been made public internally.
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The car is downstairs. It's unlocked. Who has a good idea to prevent theft?
Because there is no place to put the motorcycle battery car at home, I put it in front of my house. It's a two-story house in my own house and has been visited by thieves many times. I hate thieves now, and I can't sleep well every night. Now there is a three-wheeled motorcycle in front of my house, but there is no lock and no alarm. Who can give me some advice? ...
The easiest way to prevent your problem is to open two holes in the wall at proper positions, that is, buy a water pipe and a right-angle elbow thick enough, connect the water pipe into a ∏ shape, open a through hole at the opening position, insert the opening into the wall hole, lock the opening hole of the water pipe toward the inner wall, or insert a pin into the opening hole of the water pipe. Note that after the water pipes are assembled, the joints should be welded firmly to prevent opening, or a long pin passing through two water pipes should be inserted at the opening of the water pipes to prevent external disassembly. It can also be welded with steel bars, and the total equivalent diameter of steel bars is required to be greater than 20 mm
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Lock in the core price
Mechanical locks generally have a lock core, which can be turned with a specified key.
This kind of lock core is available in some lock factories and key repair workshops, and it has the highest versatility. Generally, the slightly better ones made in China are all made in 30 yuan, with different lengths. The invincible lock cylinder of Israel started from 300 yuan to 400 yuan, while both the lock cylinder of Israel and the lock cylinder of the United States are of full-body threaded structure, which is locked on the longitudinal groove on the outer surface with screws, and generally a lock cylinder costs more than RMB 1000.
The outer diameter of this lock core is the same, with several differences: the connecting rod driven behind the lock core and the lock core are concentric and eccentric. It is particularly important to note that the security of eccentricity is relatively higher, which enhances the resistance to thieves' hard unlocking. In addition, the length of the lock core is also different. For a long lock core with a thin door, it is necessary to use a professional thick gasket to pad the door. If you do it yourself, simply weld a thick iron ring (or several stacked rings), and the outside is longer than 10 cm. The bigger the better, the more resistant to damage and the safer the lock is. You can also pad the lock seat inside the door.
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Manufacturing technology of bicycle aluminum alloy rim
Don't lose money.
How can you grab food when others are living well?
The market is too small.
First of all, aluminum profiles should be extruded, processed in batches and opened. China's aluminum performance is poor, so it can't be a high-end racing car or a big plane. This 500 thousand is not enough for the first batch of goods
Cut the profile, then roll it into a circle with several wheels and weld it with carbon dioxide gas protection.
Drill spoke holes. Don't lose money.
There are imported aluminum materials and production lines, which cost tens of millions. Domestic equipment belongs to special equipment, so you can do it yourself. If you entrust someone else to design and manufacture, you will definitely lose your life.
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What is the brand, model and price of the lightest electric moped, and what stores sell it?
It is produced in Beijing, Beijing Shenzhou Judian New Energy Technology Co., Ltd., mainly producing power lithium batteries, with one of the smallest bicycles, ultra-light weight and aluminum alloy body.
The price is 3,000 yuan, and the battery accounts for 1500 yuan. The battery is in the middle of the bicycle bar and inside the bar. You can run 15km on a single charge, which is about 10 ampere-hour capacity, 24 volts. The front wheel drive is adopted, and the motor is installed on the front fork. The plastic rim on the front wheel has internal teeth, which are consistent with the gears on the motor.
Shenzhen ZOOM Ruim, Shenzhen Xinlong Health Industry Development Co., Ltd. (No.Longfa Road, Longhua Sub-district Office, Baoan District, Shenzhen 1 1 Store: No.35, Wenxin 1st Road, Nanhai Avenue, Nanshan District, Shenzhen, 0755-83131. Moped and electric vehicle are different in design, structure, technology, engineering difficulty and safety, so they cannot be confused. Here are their differences.
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Where can I find a Japanese Yamaha electric bicycle monopoly in Qingdao (telephone number)
At present, most of them are smuggled, and the price in 500 yuan is about 1000 RMB. Unlike domestic electric cars, this kind of car is power-assisted. If you don't ride a bike, its motor won't turn, and the riding torque is directly proportional to the driving current of the motor. When your riding torque exceeds a predetermined threshold, the driving current of the motor will linearly decrease. When your riding speed exceeds 16 km/h, the driving current of the motor will decrease linearly. When the bicycle speed exceeds 24 km/h, the driving current of the motor will drop to zero. If the wheel is stuck, you should apply a torque to the pedal of the bicycle for electric maneuver. If the car still doesn't move, cut off the input current of the motor, turn off the switch and restart it. The overall structure of this torque sensor is very reasonable, and it can transmit the torque of rotating transmission parts to a fixed angular displacement sensor, which shows that it has a solid industrial foundation in the material, design and processing of mechanical structure. Similarly, the internal transmission of bicycles was successfully copied in China 40 years ago, and was officially installed on commercial bicycles for sale. Due to the limitation of materials and processing conditions, this reverse engineering technology from physical mapping can never last long. Japanese law stipulates that bicycles should have headlights. Generally, generators driven by friction front wheels are used, and a few of them are drum generators with front wheels, rotating external permanent magnet tiles and fixed internal permanent magnets. A structure similar to the motor pulse tachometer generator in industrial control is adopted, and the generator coil is clamped by soft iron with thorns on both sides. Bicycle generators in the history of China were single-stage structures with external lines. Most mopeds in Japan are three-speed internal transmissions, usually with a central motor, a reduction gear and an overrunning clutch. Most smuggled Japanese moped batteries have reached the cycle life of charge and discharge, and there are original110v chargers. Generally speaking, Suzuki cars have the largest power.
Just entrust the sailor to buy it. Pay attention to taxes, stealing bicycles is a criminal offence in Japan! Japanese mopeds generally use brush motors, and the maximum power of motors on bicycles is stipulated by law. Hua 1.5 yuan to 15 yuan RMB can be converted into power-assisted and electric dual-purpose without changing the original controller.
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What are the disadvantages of using lithium-ion electric vehicles?
For chemical secondary power supply, the longer the charging time, the smaller the charging current and the higher the number of charging and discharging cycles of the battery. Generally speaking, it is the long life of the battery.
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What kind of bike is the most labor-saving and fast?
700-type tire, 27-inch wheel diameter kilometer racing car is the most labor-saving, but the tire strength is low, and it is still the law that its spokes will prick two holes when embedding grooves, just two at a time, no more or less; You can't drive or pick up people on bumpy roads.
600 yuan/car, bearing material is poor. The normal price is 3,000 yuan/vehicle, at least for bearings in Taiwan Province Province.
Generally, it is recommended to use Japanese-made and smuggled second-hand bicycles, generally 300-500 yuan, ordinary tires with 24-inch, 26-inch, 1 and 3/8-inch sections, which are quite suitable for long-distance riding, such as salesmen who send plane tickets, photos and express delivery, and home appliance maintenance personnel. Imported ones with cross sections of 27 "/kloc-0" and 3/8 "are also very good. Suitable for tall people, generally similar to the front diagonal beam of women's cars. The disadvantage is that tires need to be purchased from rubber enterprises in Taiwan Province Province, such as Jianda Zheng Xin, Jianda and Huafeng, which are not available in many areas. The brand-new bicycles produced by China, a Japanese-funded enterprise, are not as good as the second-hand Japanese bicycles smuggled in. Pay attention to motorcycle locks and handcuff bicycles to fixed water pipes and traffic signs to prevent theft. Mountain bike tires are too wide, suitable for riding on rugged mountain roads, suitable for carrying heavy objects, and it is tiring to ride on urban roads.
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Hello, everyone, hehe, I'm 19 male, a college student. I go to school locally, my home is in the city and my school is in the suburbs, which is about 12 km. Do you recommend buying an electric car or a bicycle?
Please help me choose. Small electric cars are quite fashionable. The basement of electric cars similar to motorcycles is not convenient for road racing, bicycles and mountain bikes are a little heavy.
Thank you! Problem supplement: I don't live in school, get up early for school, come back at noon, and have no classes in the afternoon.
Road racing is preferred. Usually, 700 tires are as thin as sausages. Because the tires are thin and narrow, it is very labor-saving to ride. The vehicle is light in weight and cannot carry loads and goods. The advantage is that it can be conveniently carried in the dormitory and placed beside the corridor or stairs, so as to implement active anti-theft. The disadvantage is that the cross section of the inner tube is small, it is not resistant to vibration, and it is afraid of potholes on the road. Therefore, it is a road racing car, which requires high road quality, and all of them are ordinary brakes. There is no imported disc brake, so the riding speed is fast, the braking ability is weak, the braking sliding distance is long and the safety is poor. Domestic road racing cars are low-priced in 400 yuan, and the normal price is 3000 yuan. This kind of bicycle is sold by fewer people and lost less. Because it is expensive, even if the host goes out to eat food stalls, he will stay within the sight of the other party, always pay attention and take it home at night. Those 30,000-50,000 yuan carbon fiber road racing cars are surprisingly light.
Mountain bike tires are too wide for off-road use and are suitable for bumpy road conditions. Riding is heavier than ordinary 26-inch bicycles with 1 and 3/8 knots.
Battery car? Electric bicycles usually use 12 ampere-hour batteries, and the new batteries will run 15 kilometers. The charge and discharge life of a battery is generally one year. Generally, it takes half a year to run continuously 10 km, which is not suitable for you. Ordinary lead-acid batteries are heavy. If lithium batteries are used, in this case, 10 km needs two sets. The battery is 3000 yuan. Ordinary electric vehicles also have a set of batteries, which need to be modified. There are few domestic enterprises that make power lithium batteries, only a few in Tianjin and Beijing. Ordinary lithium batteries, nickel-hydrogen batteries and nickel-cadmium batteries will explode when used in electric vehicles. Just like you, there is not enough charging time. Fast charging will shorten the charging and discharging cycle of any secondary battery, which is usually called service life. According to your specific situation, buy four sets of lithium batteries and put two chargers at home and school. The one in school is usually continuously charged, because the high-energy battery itself is a bomb. The charger of foreign original moped bicycle has a temperature sensor in the battery pack, and the foreign charger has no peak pulse ultra-high voltage output, so it is unattended when charging. Household chargers charge power lithium batteries, power nickel-hydrogen batteries and power nickel-cadmium batteries. You should not charge them in the dormitory. It is appropriate and safe to pay the person on duty at the door. If the battery is stolen, don't expect to claim compensation.
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Principle of Mechanical Work: Man and Bicycle
Compared with people walking, bicycles are obviously labor-saving and seem to save distance. What happened? Tell me what you know, be more specific!
There were public conclusions decades ago; When people walk, they should raise their center of gravity by 2 cm every step and move forward under the action of tendons and gravity. Cyclists do the same work in the same direction, and they can also slide.
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How to choose a bicycle?
I am a girl, I want to buy a bike to work, which is environmentally friendly and healthy, hehe ~ ~ Good idea!
How to choose a bicycle and what should I pay attention to?
Or do you have any good styles to recommend?
Please give some advice!
Supplementary question: brand? What brand is good?
Several decades ago, China imported bicycles from foreign brands such as Three Guns. Women's bicycles are characterized by high handlebars and distinctive body, which shapes the image of a lady. Please look at the old photos.
At present, Japanese bicycles are generally bought, which can be entrusted to seafarers, and high-end bicycle shops can also purchase imports. There are also smuggled ones.
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Is the electric car charger model a multi-functional model or is it paired according to the electric vehicle model?
All chargers with perfect design and manufacture can be used. Generally, it is divided into three categories according to the output power: battery charging of information electronic appliances, such as mobile phones and MP3 players; Electric vehicle battery charging; Car battery charging. In the industrial and transportation industries, there are also batteries for railway locomotives, wharf forklifts, telecommunications and servers, and program-controlled telephones.
For electric vehicles, there are 24V, 36V and 48V output voltages, which can limit the final charging voltage; Output current 1A, 2A, 3A, 4A is basically universal. As for whether to charge in multiple ways at the same time, that was the basis 30 years ago. Miners in other people's coal mines are charging in batches.
In fact, it is difficult to give consideration to the design of charging long-distance targets. Specifically, there are no elevator residents at the top floor, and chargers are installed indoors. Low-voltage, ground-based electric vehicles are charged through wires 50 meters to 100 meters long. To ensure that the charging current intensity is sufficient, the charging voltage of the terminal should not exceed the standard at the end of charging. If we want to meet the comprehensive requirements of low power consumption, we need higher skills, such as how to minimize the discharge current of the charged battery to the control circuit without charging power supply. There are many ways to choose from. The DC resistance of the actual long-distance charging line may be 10 ohm to 30 ohm. How to limit the charging voltage, output a constant current, measure the battery voltage, measure the battery temperature rise, and measure the battery bulge, instead of using a four-wire charging power supply (even the basic circuit design of a four-wire voltage-stabilizing and current-stabilizing power supply is not possible for many people in universities now)? Perfect design should ensure automatic protection when the polarity of the charged battery and the charging power supply is abnormal (China disclosed the information 35 years ago, and now the battery connected to the reverse switching power supply will explode! ! ! ), for high-energy batteries, it is particularly emphasized that the charging voltage must not have high-voltage pulse burr, which is easy to cause battery explosion! ! ! Ordinary switching power charger is not suitable.
Because of unemployment and being laid off, I was forced to retire ten years in advance, so I will not release the relevant designs that have been put into practical use for free. This is the responsibility of the Overseas Chinese Affairs Office.
I charge the electric car through the 100 meter long low-voltage line. There is a diode in the battery box to prevent malicious discharge. The diode is connected in parallel with a resistor of several hundred ohms, so that the voltage of the battery pack can be measured remotely (after the charging power supply is cut off, it is measured with a pointer voltmeter on the charger, and the diode is connected in series between the voltmeter and the charging power supply to prevent the battery from discharging the charger and reduce the reading of the voltmeter). Through more means, we can measure whether the electric car is stolen. Of course, the improved circuit is very complicated. There is a perfect electronic circuit on the side of the electric vehicle to ensure that the charging power supply voltage far exceeds the rated charging terminal voltage of the battery, and the battery will not be overcharged after charging.
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Kneel for the circuit diagram of 24V30A charger
There are many such products on sale now.
Customize your own high-power transformer. Generally speaking, the output AC voltage is 24 volts to 33 volts, and the power is 1 kw (it should be volt-ampere). Pay attention to draw more heads between the secondary 24 volts and 33 volts.
The simple method is full-wave rectification of the secondary output and direct output to the battery. The ammeter should be connected in series and the voltmeter should be connected in parallel. The output voltage and output current should be manually adjusted by the switch of industrial appliances (rich in Zhejiang Province), and manually adjusted according to the charging process. As for the charger with automatic voltage stabilization and automatic current stabilization, the control mode information of SCR has been published and printed 35 years ago. The simple emergency method is to use a running lamp transformer (36V safe voltage output), an isolation transformer and an electric welding machine transformer with sufficient power to make several turns on the secondary stage and connect them in series in the forward or reverse direction, so as to adjust the output voltage and charging current to a suitable range.
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How to remove the black oil from the bicycle chain on the school uniform?
Remember, the chain of advanced bicycles abroad uses lubricating paste similar to floor wax and car polishing wax. At first glance, there is no color on the chain. Ordinary floor wax and car polishing wax can be used instead. Clean the chain with diesel oil and kerosene before use, not gasoline! ! ! Including washing gasoline, it's too dangerous.
You use an external variable-speed bicycle, right? I modified several ordinary external variable-speed bicycles and added flexible chain sleeves to show them to a Japanese academician and doctoral tutor. The vast majority of external variable-speed bicycles have no transmission chain cover, and a few plastic external variable-speed bicycles produced in Taiwan Province Province also have no transmission chain cover. At present, half of the smuggled Japanese bicycles are internally variable-speed, and the steel of bicycles is good, light and durable. However, a good horse with a good saddle needs to choose a good lock;
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Why not made in America?
During my stay in the United States, I couldn't find American products when I bought local specialties!
Parts in electronic products, machine tools, mold materials, key metal materials and chemicals that produce molds for domestic export products. Made in America is everywhere, in basic and key parts. You should analyze China's manned spaceflight project, the design, manufacture and materials of military equipment. Therefore, the United States stipulates that if the satellites of the United States and its allies contain American elements, China will not be allowed to launch satellites, and China's business of launching satellites for foreign countries will be compressed to individual third world countries. Even if the production place of this equipment is not in the United States, the patent of production equipment and design technology may be in the hands of Americans. These are all public information, and there are many online in China. I am an expert in design and manufacturing, and I know these limitations.
The simplest and most natural textiles, printed matter, bamboo and wood products, dyes, pigments, inks, pesticides, quarantine inspection, etc. Are indispensable. Whether it is self-purchased instruments or entrusted inspection, the cost is comparable to the material procurement cost of the whole batch of manifests. What lead-free welding materials (electronic products are essential, and resistance bonding cannot always be used), environmentally friendly zinc alloys (commonly used materials for handicrafts), and environmentally friendly copper are all thresholds.
For example, Yili Company invested more than 7 million yuan, and Mengniu Company invested more than 10,000 yuan 10, and urgently purchased advanced detection instruments such as ELISA, HPLC, HPLC-MS and GC-MS..
As far as cheap handicrafts are concerned, without the identification of various testing instruments made in the United States, such as hand-held high-energy ray nondestructive testing, these products cannot guarantee to meet the safety standards of the United States, and some materials, coatings, production equipment and technologies have to be imported. The system and theory of modern science are all established in the west, and we are all marching in other people's routines. People have a long history and most of their energy is concentrated on infrastructure. Your attention is only focused on a few cutting-edge products, which is only a very small part of the western market. The investment share and consumption ratio of industrial technology and equipment in western industrialized countries are opposite to that in China.
Finally, the following suggestions are put forward for the development of China:
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Why are foreign labor costs more expensive than domestic ones, but cars are cheaper than domestic ones?
This is the embodiment of the industrial base.
In areas with weak industrial and theoretical foundations, the cost of building cars is high and the performance is far less than that of developed countries. It is the same for all industrial manufacturing industries, including missiles, airplanes, electromechanical products, mold manufacturing, bearing manufacturing and so on.
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At present, it is found that melamine in milk powder is artificially added or not completely removed in the production process.
Many imported instruments, such as infrared spectrometer, gas chromatograph, liquid chromatograph, mass spectrometer, laser scatterometer, nuclear physics detection instrument, etc. It can not only analyze whether there is melamine, but also distinguish artificially added starch, oil and protein from natural oil in milk and protein's fingerprints, and also distinguish gene fingerprints; In layman's terms, it is the truly harmless protein in dairy products, which can accurately distinguish the respective contents of natural protein and artificially added protein in milk. This is a very simple routine operation, and the technology is completely open. Large dairy enterprises have complete sets of related series of supporting instruments, and the rest is up to you to answer.
In Sanlu milk powder, your discussion of XXX and the discussion of netizens are unprofessional. At present, the detection results of various imported instruments, such as chromatography instruments, are many curves like overgrown peaks, the height of the "peak" is the content, and the protrusions and unique burrs of each known structural substance "peak" are "fingerprints", which reflect the characteristics of different substances. It is enough to draw a curve for normal milk. Once new substances, even trace amounts, are added, new "peaks" will appear in new areas; The height of the peak is its content.
It's like testing a new radio station with a field strength meter and a frequency spectrometer.
What doping testing, pesticide testing, are done in this way.
Print out the "fingerprint" and curve of a known single substance, and you can compare them conveniently.
Please take a walk to the analytical instrument factory. If the composition of Chinese patent medicine is complex, it can also be analyzed whether natural bezoar or synthetic bezoar is used.
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Is there a chicken or an egg first in the world?
The chicken comes first, and the early chicken has no eggs. With its evolution, the physiological structure and tissue morphology of chicken also evolved, gradually transitioning to eggs.