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1. Come over to tell you, this platform is a fraud platform, which is to harvest leeks by various means of customs clearance. When the currency falls, users will not be able to trade when they are ready to cut meat to stop loss. It's really extremely abusive!

2. The weapon is a little poor. I'll make a pig. I'll refine it to about 7 (no more than 300 RMB). I'll find a fixed team and brush sk every day

3. CNC machine tool is the abbreviation of digital control machine tool. It is an automatic machine tool with program control system. The control system can logically process and decode the program with control code or other symbolic instructions, so that the machine can move and process parts< Compared with ordinary machine tools, CNC machine tools have the following characteristics:
● high machining accuracy and stable machining quality
● it can carry out multi coordinate linkage and process complex parts
● when the machining parts are changed, generally only the NC program needs to be changed, which can save the proction preparation time
● the machine tool itself has high precision and rigidity, and can choose favorable processing amount, with high proctivity (generally 3-5 times of that of ordinary machine tool)
● the machine tool has a high degree of automation, which can rece the labor intensity
● it requires higher quality of operators and higher technical requirements of maintenance personnel
CNC machine tools are generally composed of the following parts:
● host, which is the theme of CNC machine tools, including machine body, column, spindle, feed mechanism and other mechanical parts. It is used to complete all kinds of cutting machine parts
● numerical control device is the core of numerical control machine tool, including hardware (printed circuit board, CRT display, key box, tape reader, etc.) and corresponding software, which is used to input digital part program, complete input information storage, data transformation, interpolation operation and realize various control functions
● driving device, which is the driving component of the actuator of CNC machine tool, includes spindle driving unit, feed unit, spindle motor and feed motor, etc. Under the control of the numerical control device, he realizes the spindle and feed drive through the electric or electro-hydraulic servo system. When several feed linkage, can complete the positioning, straight line, plane curve and space curve processing
● auxiliary device, some necessary supporting parts of index control machine tool, to ensure the operation of CNC machine tool, such as cooling, chip removal, lubrication, lighting, monitoring, etc. It includes hydraulic and pneumatic device, chip removal device, exchange table, numerical control turntable, numerical control dividing head, cutting tool, monitoring and detection device, etc
● programming and other auxiliary equipment can be used to program and store parts outside the machine
since MIT developed the first CNC machine tool in the world in 1952, CNC machine tools have been widely used in manufacturing instry, especially in automobile, aerospace and military instry, and CNC technology has developed rapidly both in hardware and software< Machining center is a kind of highly automatic multi-function CNC machine tool with tool magazine and automatic tool changing device. After the workpiece is clamped on the machining center once, it can complete a variety of processes for more than two surfaces, and has a variety of tool changing or tool selection functions, so that the proction efficiency is greatly improved
machining centers can be divided into boring milling and turning according to their processing proceres, and can be divided into three axis, four axis and five axis machining centers according to the number of control axes.

4. Many men are still in the old idea that it's women's business to have children. If you really think so. That's enough to say you're behind. Men also have to do a lot of preparation when they are ready to have children. One of the most important is physical examination. What items do you need to check? Let's introce it to you today
semen examination
in fact, semen examination is very important. We all know that semen is the carrier of sperm! We can see sperm motility, oligospermia or asthenospermia, deformity rate, mortality rate through semen examination, judge whether there is prostatitis, and put forward corresponding suggestions and decide whether to use assisted reproctive technology
urinary system examination
if men have urinary system diseases when they are preparing to have children, it can be said that it has a great impact on the next generation. Therefore, the inspection of this private part is essential. If you feel that you may have problems with testicular development, you must first ask your parents if you had mumps, cryptorchidism, testicular trauma and surgery, testicular pain and swelling, hydrocele, indirect hernia, urethral pus, etc. when you were a child. Provide these information to the doctor and consult carefully
physical examination
many male friends will not have a physical examination for several years, so it can be said that it is very dangerous. Then at this time, we should check the relevant aspects. Hepatitis, syphilis, AIDS and other infectious diseases inspection is also very necessary. The doctor will also ask the physical examinees and their families about their past health and what diseases they have suffered from? How to treat, especially to focus on mental illness, genetic diseases, etc., when necessary, also require the examination of chromosome, blood type, etc
the above are the tests Xiao Bian introced to you in preparation for having children. In fact, there are not many inspection items, but we must do them. Why don't we do it for the sake of our children's health? How should a man be a good father? Pre pregnancy examination is the first step! It's not easy to be a good father.

5. The specific contents of pre pregnancy examination for men are as follows:

1. The general examination for men before pregnancy is the same as that of internal medicine. During the examination, special attention should be paid to the development, nutrition and mental status, and whether they are healthy or not. Women also need to do the following examinations:

1. Blood routine 18 items: understanding of virus infection, leukemia, acute infection, tissue necrosis, sepsis Malnutrition, anemia, ABO hemolysis, etc

blood sugar: it can know the content of glucose in the blood, and whether it has diabetes or not.

liver function: alanine aminotransferase (ALT) can preliminarily understand whether the liver function is damaged, whether there are early symptoms of liver diseases such as obstructive jaundice, acute (chronic) hepatitis and liver cancer

hepatitis B surface antigen (HbsAg) is infected with hepatitis B virus

renal function: urea nitrogen (BUN) and creatinine (CR) can understand whether the kidney is damaged, whether there are acute and chronic nephritis, uremia and other diseases.

blood lipids: cholesterol, triglycerides, to understand the blood lipid content, hyperlipidemia will lead to increased blood pressure, and will increase the load of the heart< 2. Urine routine: 11 items can be used to know whether there is infection in urinary system and whether there is diabetes

3. Stool routine examination: stool routine examination is a necessary examination item for judging human health status. Stool routine examination includes examination of red blood cells and white blood cells in feces, bacterial sensitivity test, occult blood test (OB) and examination of insect eggs, etc. The feces of normal people are usually yellow shaped, without blood and mucus, red blood cells and white blood cells.