Insert the mining adapter into the hard disk
maybe the BIOS has been reset. Try to reset it
in the field of scientific and engineering computing, a large number of data processing calculations, such as matrix calculation, are needed, so FORTRAN language is well adapted to this point
you need to be able to query and modify data well. Maybe SQL is a good language
C and C + + may be able to adapt to the requirements of some underlying operations
* the error handling mechanism is too good, the flexibility of using result to encapsulate the running results of functions is greatly improved, and the code is also very simple.
* the functional programming support is good. With lambda, it even feels like ruby.
* the efficiency is high, without GC and runtime, There is no saying about speed.
* supports paradigm.
* has hacking skills such as macro and compiler plug-in, and has better language extensibility.
* has higher community activity and more emphasis on the role of community, such as [RFC] (GitHub - rust Lang / RFCs: RFCs for changes to rust)[ The disadvantages of rust China are as follows:
* the language features are complex, so it is not so friendly to novices.
* the stability is not enough, the evolution of language is more radical,
* the maturity of third-party library is still behind go, and the commercial application is not enough
I don't have any experience in programming. I think programming is too complicated. I don't like to study too much and I don't know much about it. I can only say that I'm half hanging, that is, my knowledge is patchwork. My friend told me to read some books by myself. I can only say that I can give some experience according to my own experience
< HR / >
in fact, I think code and programming are more suitable for students of science and engineering to study. I have a big head at first sight, and I don't understand what I'm talking about. This is what I know about the language. You can understand it in many ways. It's not that it's bad if it has shortcomings. It depends on the configuration. Everyone's habits are different. Maybe some people think it's good to use unstable language. Some people like perfect language. In my opinion, programming is really complicated and there will be a lot of code, These codes make my head bigger, and sometimes I have to mend them
trust is well designed in terms of security, performance and development efficiency
the disadvantages of trust may lie in its peculiar grammar, many new concepts and steep learning curve< So there is no perfect language, every language has its own goal. Trust is a system language. If you design it like python, you may have to make a lot of compromises and give up many of its design goals, which is not worth the loss.
practice has proved that the management of RMB collection is better than stamps, stamps are more delicate, easy to mold, yellow, moth eaten, long spots and so on. For example, the coins are not backed and printed with high-grade paper, but if you don't pay attention to keeping them, they will be damaged. According to the author's own practical experience and lessons, talk about some preliminary experience
the first step is sterilization. Money in the circulation process, do not touch hands, will be infected with bacteria, sweat, water, st and other dirt invasion. The coins collected should be sterilized and cleaned up first. The most simple and effective sterilization method is ultraviolet disinfection. There are three kinds of ultraviolet lamps: 15W, 20W and 30W. Generally, 30 power ultraviolet lamp is used to disinfect coins. When irradiating, the temperature should be 15-30 degrees. Irradiating 30-40 kinds of coins within a distance of 20-40 cm can kill bacteria with good effect. In places without ultraviolet conditions, coins can also be put in the sun for 2-3 hours, which can also achieve the purpose of sterilization and moisture removal
the second step is plastic sealing. The sterilized coins are put into the standard plastic coin protection bag with tweezers, and then the plastic coin protection bag is sealed. The method is also very simple, as long as an ordinary low-power electric soldering line and a straight ruler are used. The electric soldering line is a simple transformation. Just file the end of the soldering line with a file to form a small knife edge. When in use, after the iron is heated, press the seal with a ruler, and scratch the excess part with a knife. At the same time, the bag mouth will be sealed naturally in high temperature. For long-term preservation, the coin can also be put into a plastic coin protection bag and sealed like a plastic photo. When it needs to be taken out in the future, use scissors to cut it on the edge of the protection, and then use tweezers to take out the coin. The sealed coin can protect the proct from sweat and st
the third step is to load the coin book. Now there are many kinds of the third set of RMB books, so we should try to choose those with better quality, more kinds of coins and more exquisite designs. After the coin book is bought, the plastic coins will be placed in the proper position, which is not only economical and affordable, but also convenient for management, appreciation and research. It not only protects the appearance of the proct, but also can be stored for many years, making a huge profit
Step 4, put it in the cabinet. It is generally stored in some well sealed containers such as fir box, iron box and safe. In order to keep the collection from deterioration, don't store it in a picture box. There should be a gap in the coin book placed in the box, and attention should be paid to the way of placing, rather than stacking, in order to prevent crushing coins
in the fifth step, put in the desiccant. After the coins are put into the cabinet, attention should be paid to insect proof, moisture-proof and mildew proof. Insect prevention is mainly to prevent wingless insects from drilling holes in coins. The commonly used drugs are sanitary balls, camphor pills and carbon dioxide. Moisture proof is mainly to keep the coin books sealed. Mildew prevention is mainly to use desiccant and adjust the humidity in the storage room. These effective measures are taken to protect coins. In addition, take maintenance measures. According to the seasonal change, ventilation and air drying should be carried out once every 2-3 months, which can ensure the quality<
collect coins skillfully and cleanly
at present, many collectors are collecting gold, silver, nickel copper alloy, red copper, steel cored nickel, copper zinc alloy, copper and other metal coins at all times and in all over the world. They always feel that many coins have been issued for a long time and have been circulating in the market. There are varying degrees of corrosion on the coin surface, and various kinds of dirt and bacteria are gathered. Even if the coins are not circulated, they will change color and oxidize, which greatly reces the value of collection and appreciation. In view of the different degrees of dirt on coins, this paper introces several cleaning methods:
coins that are oxidized, dark and dirty are soaked in boiling water first, then some toothpaste is squeezed on the coin surface, and then scrubbed with soft cloth, repeated several times
if the coins are of different procts, have been issued for a long time, and have been oxidized or rusted, soak the coins (except aluminum coins) in vinegar for a few minutes, take them out, wash them with clean water, and then rub them with a coin brush (made of glass fiber) for several times to remove the impurities and dirt on the surface
for the whole proct and modern coins, the surface of the coin only has a slight oxide layer, st, hand sweat, fingerprints, etc., which can be rubbed repeatedly with a rubber, and its surface will be as bright as new
the coin surface has been oxidized. If the dirt is serious, it can be rubbed with a coin brush to remove the dirt and oxide layer and restore its original appearance
coins with serious dirt and unclear patterns can not be removed by the above methods. First soak them in dilute hydrochloric acid for a few minutes, then soak them in alkaline water for a few minutes, then wash them with clean water, and finally brush them with coins
the coins treated by the above methods should be smeared with sewing oil. Wipe it clean with a dry cloth, and then put it into the book by category. Your collection will look brand new