问题描述：
[单选]
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
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答案解析：无
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上一篇：The pumps employed on board ship can be divided into two main categories ie（）pumps and centrifugal pumps．
下一篇：The projection on a shaft designed to change circular motion into up and down or back and fore motion is called（）．
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