单项选择题
A.cut off the power
B.cut off the oil inlet
C.open guide water valve
D.close oil outlet value
单项选择题 When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.
单项选择题 The separating effect of oil separator is not very good, the reason may be（）
单项选择题 When separating fuel oil in oil separator, the separating quantity is（） of the real quantity.