问题描述：
[单选]
The plunger in the fuel injector pump， usually operated by a（）， is driven up and down when working．
A．crankshaft
B．camshaft
C．piston rod
D．rack and pinio
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答案解析：无
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答案解析：无
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上一篇：The ports are drilled in the liners at an angle of approx 20℃ the result being that（）is given a rotary movement．
下一篇：The piston supporting body is mainly subjected to（）stress．
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