Pen jam
Is there any good way to solve the pen blockage?
After decomposition, use a toothbrush to wipe under running water; Dismantle the snorkel with the diameter of 1.5 mm and the multi-groove phenolic resin bakelite, insert it with a medical syringe, and spray clean it.
From the metallurgical industry, it is impossible to produce advanced alloy with corrosion resistance, low friction coefficient and wear resistance, which reflects the quality of key military materials and industrial bearings and vividly reflects the national defense strength.
As far as manufacturing is concerned, high-end special production equipment must be completely imported. The automatic production equipment of all kinds of pens produced in Germany is generally 3 million, which does not occupy the area. Moreover, the materials and accessories used for a good horse with a saddle must also be imported. Therefore, since the production of ballpoint pens before the Cultural Revolution, the quality has not reached the present; The good ones are produced by imported production lines, and some inks should also be imported; The technology of producing nib ball is also a true reflection of national defense strength. The country that can produce precision cemented carbide beads and ceramic beads in large quantities at low cost is an excellent equipment production industry, which is invincible in the field of military equipment such as ceramic bearings! !
Then, there are not many excellent pen maintenance personnel. In the past, old department stores had such a maintenance point, and the nib could be welded and polished again, because everyone had writing defects, and the nib was gradually worn off, and the golden tongue felt good when writing. If the nib is broken, it is necessary to weld the nib and keep the nib. Those who go to primary schools to fix pens just want to trick primary school students into having a golden pen and a golden tongue.
Whether you can repair your own pen is the embodiment of national quality and the theoretical level of thin shell mechanics. Does your pen feel astringent? Did it not go well? Don't miss such a good practice opportunity, don't entrust others, practice by yourself! This is consistent with the sheet metal process and the skill of adjusting bicycle spokes.
The popularity of computers and printers is attacking China culture and destroying China calligraphy.
Compared with traditional pens, ballpoint pens greatly waste the earth's non-renewable resources and destroy the environment. When most people reuse traditional pens, they enter an era of extreme shortage of earth resources.
In the early days of reform and opening up, teachers in colleges and universities focused on the teaching direction, and came to the conclusion that analog circuit teaching was basically cancelled, which was only in form, because the price and performance of foreign integrated circuits could not be replaced by circuits built with traditional discrete components in China; Since then, teaching, vocational education and home appliance maintenance have all centered on integrated circuits; Then in the information age, computer technology and network technology are the most important and core of scientific and technological development. Trenchless technology has been popularized in main roads, and directional drilling technology has been widely used in urban underground pipeline laying. This kind of underground drilling rig with steering drill pipe can be copied in China, with a set of imported 6.5438+0 million and a set of domestic 400,000. Guided ground penetrating radar must be imported, with a general performance of 300,000; Now this kind of radar is indispensable for urban construction, gas pipeline construction, underground cable construction and water supply system construction. House decoration and property management need a smaller ground penetrating radar, each of which costs 6.5438+0.8 million yuan. The traffic police's speed radar is similar. The gas company's high-sensitivity detection instrument for detecting the air leakage of thin pipes under roads is made in Germany, and a million-dollar instrument is also an analog instrument.
Looking at high-end instruments for deep space exploration, bioengineering, medical instruments, analytical instruments, high-energy physics research, biological origin, archaeological research and forensic evidence identification, all imported instruments dominate the world and are based on simulation technology. For example, Hubble telescope, black hole exploration, gravitational wave detection and satellite photos are all data obtained by using them. The input and output of inertial guidance system, mobile phone, base station, computer, TV, camera, scanner, video camera and other information equipment are mostly analog processing processes, but digital processing processes are adopted in the middle. Now analog and digital hardware and even software are integrated. Without basic design ability and semiconductor process equipment, we can only adopt the method of system integration. The superior strength and greatest ability are the use of algorithms and DSP. In the market, we must use other people's core software and hardware to open the back door and introduce security risks. Therefore, in theory, it is a half-empty crane, and in application, it is the final consumer, always downstream of the industrial chain.
Einstein's theory of relativity was put forward based on a large number of physical and astronomical experiments and basic observation data obtained with advanced hardware at that time. There are many graduate students who don't really understand the basic components of the circuit. Under this premise, it is impossible to make a decent basic circuit by relying on circuit simulation software.
Therefore, students should first use simulated pointer multimeter to establish perceptual knowledge and imagination. China people are good at abstract thinking because it takes a long time and costs a lot to cultivate deep correct intuition, and few people can cross this threshold. In contrast, it is too easy to play math and English, recite formulas, solve exercises and quote documents.
With the common teaching methods, syllabus, textbooks, experimental devices and innovative projects in China for decades, it is impossible to train people who can design circuits skillfully. At least ten basic circuits should be designed and debugged; Systematic design and integration of more than ten application combination designs is the most basic education.
There are many countries that can build satellites, launch vehicles and nuclear weapons. How many of the basic materials, precision processing equipment and precision instruments are made in China, which represents their industrial base and overall innovation ability? What is the international level of basic industries? In this way, the industrial products mass-produced by others, even if you manufacture them at a higher production cost, can not achieve the performance and reliability of others. Under the condition that the industrial foundation is not solid, the modern industry is not perfect, and the national quality is * *, to keep up with the development of the world and the urgent pressure of the economic form, we can only give priority to information construction, which is bound to be stretched and must be made up; Jerry-building in housing construction has caused hidden dangers, discord among neighbors and constant disputes. Therefore, the waterproof and leak-trapping industry is booming and social resources are wasted. When building a house, pay a little attention, and you can look back with a little money.
It is suggested to carry out free online video tutoring activities, record the whole process with high-definition video, and release it after sorting out.