單項(xiàng)選擇題

The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.

A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities

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單項(xiàng)選擇題

The remaining oil in the lubricating pipes and ducts should be blown out with （）.

A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds

單項(xiàng)選擇題

The quantity of oil injected into the cylinder can be regulated （）.

A.by turning the pump plunger
B.by vary the fuel valve spring force
C.by no means by controlling the governor
D.by enlarging or diminishing the injection hole

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