单项选择题
A.differential of crank-webs B.indicator diagrams C.lube oil reading out D.misalignment of crank-throws
High-speed rotating in a centrifugal purifier can produ...
单项选择题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.
A.many thousand times B.between times C.one time D.at times
Here some oil in the oily water separator, as a result ...
单项选择题Here some oil in the oily water separator, as a result of its lower （）, will separate and rise into the oil collection space.
A.temperature B.viscosity C.density D.velocity
Heat energy is a source of power, but （） will cause dam...
单项选择题Heat energy is a source of power, but （） will cause damage to the engine.
A.excessive heat B.insufficient heat C.effective cooling D.high output
