On the 9th, the Changchun Municipal Government held the second meeting of the Joint Conference on the Construction of Key Projects of FAW in Nong'an County, and listened to the work report of the first-phase work of the Municipal FAW Key Project Constr.......
Using the Hall effect principle, when the metal tooth passes through the front end of the Hall sensor, the magnetic field changes, the Hall element detects the magnetic field change, and converts it into an alternating electric signal. The buil.......
Pest and disease investigation is the basic support for scientific prevention and control. In the field of agricultural plant protection, through a series of investigations, we can initially grasp the occurrence of major diseases and insect pests of wheat, rice and other crops, a.......
In China, drought disasters have occurred, causing great troubles and obstacles to agricultural production. According to statistics, in the past ten years, the average annual drought area of ​​the country has reached 400 million mu, more than twice that of the 1950s.......
When the magnetic pole is inclined at an angle to the horizontal, the ore is magnetized in the original vertical direction as the magnetic pole is inclined.
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Today, cars are getting faster and faster. Different types of cars have different sizes, colors, models, etc. According to different factors, there are always so many cars that meet the conditions you want.......