Classes are widget types that are used to implement certain functions. Generally, for example, in actual factories, such as wheels, all wheels have a feature, that is, they are round and have bearings to realize rolling function, so the parts only need to specify the wheels and then the radius. Such parts can be copied without ordering every time.
For example, in the program, you define a student with attributes such as name, class and attendance in class, so that each student does not need to write such a definition.
Asp is not really object-oriented, so the class functions in it are not like java or asp. So powerful.
What are the classifications of copper? What are the applications? Copper alloys mainly include beryllium bronze, silver-copper alloy, nickel-copper alloy, tungsten-copper alloy and phosphorus-copper alloy. Copper alloy is a malleable and castable alloy, which is a copper-based alloy strengthened by aging precipitation. After quenching and aging treatment, it has high strength, hardness, elastic limit, good stability, corrosion resistance, wear resistance, fatigue resistance, low temperature resistance, non-magnetism, good electrical conductivity and thermal conductivity, and does not produce sparks when impacted. Beryllium copper materials are basically divided into high strength and high elasticity beryllium bronze (beryllium content is 1.6%-2- 1%) and high conductivity beryllium alloy (beryllium content is 0.2%-0.7%). Beryllium bronze is often used as high-order and precise elastic components, such as connectors, reversing switches, spring parts, electrical contacts, elastic ripples, wear-resistant spare parts, molds and tools for spark-free impact in mining and petroleum industries. At present, beryllium copper materials have been widely used in aerospace, electrical appliances, large-scale power stations, household appliances, communications, computers, automobiles, instrumentation, petroleum, mining and other industries, and enjoy the reputation of the elastic king of non-ferrous metals. 2. Silver-copper alloy. Silver-copper alloy is made by melting 58 Qing Xue and 2004.6438+0 mushrooms with pure copper and pure silver in an electric furnace, casting them into blanks, and then processing them into finished products of various specifications. The main applications of silver-copper alloy are electrical contact materials, welding materials, silver-copper alloy bars and copper-silver alloy contact wires. 3. Nickel-copper alloy. Nickel-copper alloy is usually called white copper. Adding nickel to pure copper can significantly improve the strength, corrosion resistance, resistance and thermoelectric properties, which are mainly used in seawater desalination and seawater heat exchange systems, automobile manufacturing, shipbuilding industry, coins, resistance wires and thermocouples. Industrial white copper can be divided into structural white copper and electrical white copper according to their performance characteristics and uses, which meet various corrosion resistance and special electrical and thermal efficiency respectively. White copper wire is a kind of corrosion-resistant material and decorative structural material widely used in the world. It is used to manufacture corrosion-resistant and elastic components, medical instruments and daily decorations in industrial sectors such as instruments, electromechanical, chemical industry, health and daily hardware. 4. Tungsten-copper alloy. Generally, powder alloy technology is used for production. This alloy is mainly used to manufacture high-voltage contacts, such as circuit breakers, load switches, ring network cabinets and other high-voltage appliances. Excellent corrosion resistance, welding resistance and voltage resistance. Tungsten-copper alloys should also be used in golf accessories, shielding materials and electrical materials. 5. Phosphorus-copper alloy. 1954 during the research and development of sulfate bright copper plating process on copper anode in the United States, it was found that a small amount of phosphorus was added to the copper anode, and a black "phosphorus film" was formed on the surface of the copper anode during the electroplating process. This kind of "phosphor film" has metal conductivity, which controls the electroplating speed, makes the coating uniform, does not produce copper powder, greatly reduces the formation of anode mud and improves the quality of the coating, thus "phosphor copper anode" appears. Phosphor-copper alloy is mainly used as phosphor-copper anode for printed circuit boards, hardware, plastics and electroforming. Copper tape for electrical contacts and connectors: copper tape for lead frame: solder used to replace silver in motor, air conditioner and refrigerator industries; Deoxidizer for copper and copper alloy materials and grain refiner for aluminum alloy castings.
What are the types of electric heating? What are their functions? There are too many electric heating films, heating cables, electric boilers, electric heating plates, electric heaters and radiators.
What is the function of EXCEL pivot table? What are the applications? Pivottable is an interactive report, which can quickly merge and compare a large amount of data. You can rotate its rows and columns to see different summaries of the source data, and you can also display the details of the area of interest.
If you want to analyze related summary values, especially when you want to sum a large number and compare each number multiple times, you can use a PivotTable report.
What are the functions of the application field of microcontroller? A microcontroller is also called a monolithic microcontroller. They are not chips that perform some logical function, but integrate a computer system into a chip. It is equivalent to a microcomputer. Compared with computers, microcontrollers only lack I/O devices. To sum up: the chip becomes a computer. It is small in size, light in weight and cheap, which provides convenient conditions for learning, application and development. At the same time, learning to use single chip microcomputer is the best choice to understand the principle and structure of computer.
Microcontrollers have been widely used, such as intelligent instruments, real-time industrial control, communication equipment, navigation systems, household appliances and so on. Once the microcontroller is used in various products, the product can be upgraded, and the adjective "smart" is often used before the product name, such as smart washing machine.
What are the enterprise QR code applications? What's the role? Mainly reflected in the following four functions:
1. As one of the important portals of the mobile Internet, the QR code builds an interactive bridge between enterprises and consumers, and provides applications such as rich media communication, sharing, comments, lottery, investigation, voting, classified advertisements, etc.
Second, through mobile e-commerce and payment, we can realize the shopping service of one thing and one store. For example, the box of honey products is printed with a QR code. After purchasing honey, if consumers feel that the quality is good and want to buy it, they only need to pay by phone directly, and then they can wait for the express delivery.
Third, provide O2O vouchers and closed-loop applications for e-commerce platforms. QR code is one of the best forms of electronic logistics, because it can be encrypted and carried by mobile phones. At present, Taobao, JD.COM Mall and Store 1 are all connected to Huayang ICT's e-cert platform service.
Fourth, product traceability. Recently, the incident of "Taobao's bad review exposed 100 million fake goods" was exposed, and the counterfeit and shoddy products of e-commerce platform once again entered the public eye and received widespread attention. Two-dimensional code has a large amount of information, which can read and write data and track the whole process of product flow. In fact, many e-commerce brands have begun to realize this problem and use QR codes to monitor product quality and sales flow.
What are the kinds of trees and their functions? Pine, cherry and buttonwood trees. Functions such as willows are functions of trees. For people, it can make oxygen, reduce carbon dioxide, vacuum, purify air, make organic matter, fix soil, chemical raw materials, prevent wind, cool down and transform inorganic matter. An acre of forest can absorb 67 kilograms of carbon dioxide and release 49 kilograms of oxygen every day. An acre of trees can evaporate 42 tons of water in a summer, which can reach 300~500 tons a year. One acre of trees can collect 22~60 tons of dust a year. One acre of trees can absorb 4 kilograms of toxic gases a month. An acre of forest land stores 20 tons more water than an acre of forest land. One mu of windbreak forest can protect 100 mu of fertile land from wind disaster. 1 carries out photosynthesis, absorbs carbon dioxide and releases oxygen. Transpiration, air humidity adjustment, soil consolidation, soil erosion prevention, wind and sand prevention, increasing greening, beautifying the environment, enjoying beautiful scenery, increasing artistic composition, industrial value, wood, woodcarving and other wood products, making medicinal materials to meet your childhood wish: let you climb trees to play! Ha ha laugh
What kinds of grapefruit are there? What's the role? Pomelo is a mature fruit of Rutaceae pomelo, which is produced in Fujian, Guangdong and other southern regions of China, and Shatian pomelo in Guangdong is the top grade.
Taste sweet and sour, slightly bitter, rich in vitamin C and a large number of other nutrients, is recognized by the medical community as the most therapeutic fruit.
Modern pharmacological analysis shows that the pulp and peel of grapefruit are rich in immature bitter orange, new orange peel and carotene, B vitamins, vitamin C, minerals, sugars and volatile oil. Pomelo peel is similar to other flavonoids and has anti-inflammatory effect. Pomelo peel compound has stronger anti-inflammatory effect than pure product. Modern medical research has found that grapefruit meat is rich in vitamin C and insulin-like components, so it has the effects of lowering blood sugar, reducing blood fat, losing weight, beautifying skin and nourishing. If eaten regularly, it has an auxiliary therapeutic effect on diseases such as diabetes and arteriosclerosis, and has the effect of strengthening the body and caring skin for obese people.
Nutritional analysis
1. Grapefruit contains potassium, a natural trace element necessary for patients with hypertension, and almost contains no sodium, so it is the best dietetic fruit for patients with cardiovascular and cerebrovascular diseases and kidney diseases.
2. Grapefruit contains a lot of vitamin C, which can reduce cholesterol in the blood;
3. Pectin in grapefruit can not only reduce the level of low density lipoprotein, but also reduce the damage of arterial wall;
4. Grapefruit also has the function of strengthening the body, which helps the body to absorb calcium and iron more easily. The natural folic acid contained in it can prevent anemia symptoms of pregnant women and promote fetal development;
6. Fresh grapefruit meat contains chromium, which is similar to insulin and can lower blood sugar.
Related population
The general population can eat it.
1. Patients with gastropathy, dyspepsia, chronic bronchitis, cough, excessive phlegm and asthma, especially those with cardio-cerebral nephropathy;
2. People with spleen deficiency and loose stool should eat carefully.
food therapy
Flesh: sweet and sour, cold and non-toxic, with the effects of strengthening the spleen, relieving cough and hangover;
Pomelo peel: bitter and sweet, warm in nature, with the effects of resolving phlegm and relieving cough, regulating qi and relieving pain;
Indications: Cough and asthma, qi stagnation, chest tightness, abdominal cold pain, dyspepsia, hernia, etc.
Other related
The annotations in Shennong's Herbal Classics are simply called pomelo, Er Ya Tiao and Lei You. Tao Hongjing originally called pomelo, and there are pomelo, smelly orange, smelly pomelo, bamboo Luan, fragrant Luan and Dan Wen. It belongs to the fruit of Rutaceae evergreen tree pomelo. Its hometown is in China, and it has been cultivated for more than 2500 years. Widely planted, so there are many varieties. The famous varieties are Wendan pomelo, Shatian pomelo, Pingshan pomelo, Sijipao, Dahongpao and so on. , are the best in China pomelo.
"The smoke in the tree cage is suspected of carrying water, and the mountains and mountains are like gold." This is a famous sentence by Zhang Tong, a poet in the Tang Dynasty, from which we can see the beautiful scenery of grapefruit harvest, which is fascinating.
comment
1. Too bitter grapefruit is not suitable for eating; Peeled grapefruit
2. If you eat too much grapefruit at a time, it will not only affect the detoxification function of the liver and damage it, but also cause other adverse reactions and even poisoning, including dizziness, nausea, palpitation, tachycardia, fatigue, hypotension and other symptoms. Eating grapefruit or drinking grapefruit juice during taking the antiallergic drug Terfenadine is particularly dangerous, which can lead to arrhythmia and even sudden death in severe cases. There are many drugs that can interact with grapefruit, such as calcium antagonists such as nifedipine, verapamil and diltiazem, antipsychotics such as clozapine, gastrointestinal drugs such as cisapride, immunosuppressants such as cyclosporine A and central stimulants such as caffeine. Experts pointed out that when taking these drugs, just drinking a glass of grapefruit juice may cause the above effects. Therefore, medical experts warn patients not to eat grapefruit or drink grapefruit juice when taking medicine, especially elderly patients, in case of accidents.
What kinds of pencils are there and what are their functions? 1, pencils are classified according to the amount of graphite in the refill. Generally divided into three categories: h, HB and B.
(1) Class H pencil, with relatively high refill hardness, is suitable for objects with relatively hard or rough interfaces, such as carpentry scribing and field drawing. HB pencil refill has moderate hardness and is generally suitable for writing.
(2) Class B pencils, with soft refills, are suitable for drawing, and can also be used to draw cards that can be recognized by machines. For example, at present, we often use 2B pencil to fill in the answer sheet.
(3) There are colored pencils, also known as crayons, which are mainly used for drawing.
2. Pencils are divided into ordinary pencils and drawing pencils. The characteristic of drawing pencil is that the hardness of pencil core is divided into 13 grades, which are distinguished by English letters H and B. H stands for hard, B stands for soft, and the hardness is H 1-H6. The larger the number, the stronger the hardness and the lighter the color. Softness ranges from B 1-B6. The larger the number, the greater the softness and the heavier the color. Ordinary pencils only have HB grade, indicating moderate hardness.
Pencil hardness grade 6B 5B 4B 3B 2B HB H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H.
6B: Soft lead with dark color and dark side;
4B: lead is soft and dark, and dark lines are drawn;
2B: Lead is softer and darker than HB;
HB: lead is common, and the color ratio is 2 hours deep, so it is commonly used;
2H: Lead is hard, the color is average, and it is commonly used;
4H: Lead is hard, slightly lighter in color, and small bright lines are drawn;
6H: The lead core is hard, light in color and painted brightly;
What are glands, organs and functions? You can go and have a closer look.
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There's nothing about thymus there. Let me add something.
Thymus is a part of human body, where some myeloma cells mature.
It has a matchbox-sized yellow-gray tissue at the upper end of human sternum, which is located between the left and right lungs. This is the thymus. In the past, people regarded the thymus and appendix (cecum) as useless organs that had not completely degenerated during evolution. Over the past half century, with the progress of immunology, people have realized the important role of thymus in human immune function and praised it as the king of immunity. To know the king position of thymus in immunity, we only need to look at the role of lymphocytes as the main force of specific immunity and their relationship with thymus.
70-80% of lymphocytes in blood are T lymphocytes (T cells for short). They were originally tiny white blood cells growing in bone marrow, which were sent to the thymus by blood. After being cultured by thymic hormone, they became mature T cells without immune function, and then sent to organs such as spleen and lymphatic system, where they grew up under the action of thymic hormone, ready to resist all kinds of enemies harmful to human body. Thymic hormone can also improve the killing ability of lymphocytes and induce B cells (also a kind of lymphocytes) to mature.
In embryonic stage, the thymus is bigger than the heart, even bigger than the lung, reaching the maximum in adolescence, then gradually degenerating, and decreasing to about 10g in middle age. Thymus tissue is gradually replaced by fat, and after 50 years old, the secretion of thymic hormone stops completely. Thymus, the king of immunity, retired after establishing and training an immune army.
This is only part of the content. If you want to know more, you can consult medical books.