单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

The purpose of the flywheel of a diesel engine is to （）.

A.counterbalance the crank throws on the crankshaft
B.keep the engine running smoothly between power stroke
C.provide a belt-driving surface for the operation of auxiliary machinery
D.prevent the engine from overspeeding