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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

When separating fuel oil in oil separator, the separating quantity is（） of the real quantity.

A.100%
B.80%
C.1/2
D.1/3

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