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
点击查看答案&解析
相关考题
-
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 -
单项选择题
The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.
A.the pump cylinder
B.the pump cam
C.the pump plunger
D.the pump miler -
单项选择题
The projection on a shaft designed to change circular motion into up and down or back and fore motion is called （）.
A.wheel
B.crankshaft
C.running gear
D.cam
