单项选择题

The rim of the piston may contain cut-out portions to accommodate （） when they open.

A.the gases
B.the air
C.the valves
D.the injectors

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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

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