问题描述：
[单选]
The main moving parts of a diesel engine consist of the（）and the pistons．
A．bedplate, connecting rods
B．crankshaft, the connecting rods
C．frames, crossheads
D．crankshaft, the cylinder
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答案解析：无
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上一篇：The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the（）cycle．
下一篇：The main function of the lubrication system in to enable（）of a film of oil between the moving parts．
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