Digital currency cable
warm tips: at present, the state has not officially announced the existence of a legal virtual currency company. According to the notice and announcement issued by the people's Bank of China and other departments, virtual currency is not issued by the monetary authority, does not have the monetary attributes of legal compensation and compulsion, is not a real currency, does not have the same legal status as currency, and cannot and should not be used as currency in the market. Citizens' investment and transaction of virtual currency are not protected by law, The above information is for reference only and does not represent any investment proposal
response time: January 13, 2021. Please refer to the official website of Ping An Bank for the latest business changes
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for others, you can only say that as long as it is a new digital currency with low price, you can start a little bit!
Spindle speed = 1000vc/ π D
the selection of cutting tools and the determination of cutting parameters are important contents in NC machining process, which not only affects the machining efficiency of NC machine tools, but also directly affects the machining quality
in the traditional cutting mode, the cutting speed is always selected according to the selected cutting depth and feed speed, and a more reasonable value is selected under the condition of ensuring the reasonable tool life. This is because the cutting speed has a very obvious impact on the tool life. Generally, increasing the cutting speed will greatly rece the tool life
According to Salomon's high-speed machining theory, when the cutting speed is increased to a certain value, the cutting heat and cutting force that affect the tool life are reced in varying degrees, so as to improve the cutting conditions to a certain extent
extended data:
in traditional machining, the feed speed is limited by the cutting speed and the rigidity of the process system, and the value is generally small; But in the high-speed machining mode, because of the increase of cutting speed, the cutting force and cutting heat are reced, which makes it possible to choose a larger feed speed when machining small resial materials
At the same time, larger feed speed can also effectively prevent the workpiece surface and tool burn, chip build-up and work hardening caused by high cutting speed. For example, when the ball end milling cutter with a diameter of 10 mm TiAlN coating material is used to process the pre hardened steel with a hardness of 40 HRC, when the spindle speed reaches 12 000 R / min, the feed speed can be as high as 2 500 mm / minwhen the tool diameter is smaller and the spindle speed is higher, the feed speed can be higher. However, the higher the feed rate, the better, because too high feed rate will make the surface quality of the workpiece decline
Principle: the reproctive system of chicken is different from that of fetal mammal. The testis and epididymis of the rooster are in the abdominal cavity. The mating organ is a degenerated reproctive process, and the head of sperm is a long cone. The sperm can survive in the nest of sperm gland of ovict for 24 days and have the ability of fertilization
Only the left ovary and fallopian tube developed. When the fertilized eggs are discharged from the body, the hens will not reach the critical level of hatching (24 ℃), and their development will be suspendedchickens reproce by fertilized eggs. An average hen lays 300 eggs a year, with an average hatching rate of more than 70%. Before spawning, they grunt (continuously) and usually squat down if they are in danger or caught
extended data:
only "fertilized egg" can hatch chicken. To see if the egg is fertilized, you can shine the egg on the light bulb. If there is a small circle shadow on the side of the egg (that is, the pores of the egg are broken by the boiled egg with shell), it means that the egg has been fertilized. If there is no shadow, the chicken cannot hatch. Whether it is natural mating or artificial insemination, the sperm will quickly go up the fallopian tube and reach the seminal fossa in the horn