问题描述:
[单选]
The piston moves up and down, thus causing the rotational movement of the()
A.crankshaft
B.connecting rod
C.cross-head
D.main beating
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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 piston moving up and down keeps the crankshaft().
下一篇:The pistons are cooled by oil supplied from the forced()system.
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