问题描述：
[单选]
The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the（）cycle．
A．two-stroke
B．four-stoke
C．long-stroke
D．short-stroke
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答案解析：无
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上一篇：The marine diesel engine is a type of diesel engine used on ships The（）of its operation is not very difficult to understand．
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