单项选择题
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
The purpose of the flywheel of a diesel engine is to （）...
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
The pumps press oil into the cross-head bearing gap whe...
单项选择题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
The pumps employed on board ship can be divided into tw...
单项选择题The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.
A.gear B.nonpositive displacement C.positive displacement D.rotary
