单项选择题
A.control the back pressure of return oil B.lock the oil lines under some conditions C.change the direction of oil flow D.act as relief valve
Check value is used to control （）A.direction of oil flo...
单项选择题Check value is used to control （）
A.direction of oil flow B.back pressure of return oil C.bypass of filter D.high pressure overflow
（）can cause oil flow from sludge outlet of self cleanin...
单项选择题（）can cause oil flow from sludge outlet of self cleaning separator.
A.Too much sludge accumulated in separator bowl B.Diameter of gravity disc too large C.High level tank lack of water D.Oil input too rapidly
（）can not cause oil flow from water outlet of self-clea...
单项选择题（）can not cause oil flow from water outlet of self-cleaning separator.
A.Oil temperature too high B.Diameter of gravity disc too large C.Oil temperature too low D.High level tank out of water
