单项选择题
（）can cause oil flow from water outlet of a separator.
A.Oil inlet valve opening too quickly B.Oil temperature too high C.Diameter of gravity disc too small D.Viscosity of oil too low
单项选择题 When finish work on the oil separator, you should（）firstly.
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（）
