When bilge water is heated in a holding tank, which one of the following statements is not
A. The high temperature facilitates primary gravity separation
B. Most of the oil and organic solvents are raised to the top layer
C. The high the temperature is, the more the top oil will be collected
D. The high temperature has little use on the separation of emulsified oil
查看答案
为提高刚度和抗振性,有的机床主轴采用三个支承,一般这三个支承可以都是主要支承。()
机械的自锁是指由于摩擦的存在以及驱动力作用方向的问、出现无论驱动力如何增大,机械都无法运转的现象。()