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


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1.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

4.單項選擇題One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

A.seal water supply be cut off
B.make up water supply be cut off
C.oil outlet valve closed or not open sufficiently
D.the flow rate of oily water is too much

5.單項選擇題When two oil separators are working in series, they should work with （）

A.both as clarifiers
B.first one as clarifiers, second one as purifier
C.both as purifiers
D.first one as purifier, second one as clarifier