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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The pumps press oil into the cross-head bearing gap when the load on the shell is at its lowest What is the meaning of “its” in the sentence above?（）

A.the cross-head
B.the pumps
C.the shell
D.the load