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
单项选择题 The purpose of the flywheel of a diesel engine is to （）.
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?（）
单项选择题 The pumps employed on board ship can be divided into two main categories ie（） pumps and centrifugal pumps.