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單項選擇題

When finish work on the oil separator, you should（）firstly.

A.cut off the power
B.cut off the oil inlet
C.open guide water valve
D.close oil outlet value

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單項選擇題

When separating the lube oil without additive, it is usually cleaned with hot water; the aim is to remove （） from it.

A.acid
B.sludge
C.mechanical impurity
D.salinity

單項選擇題

The separating effect of oil separator is not very good, the reason may be（）

A.too little seal water
B.improper gravity disc
C.oil discharging pump not working very well
D.low water level of the working water