问题描述：
[单选]
The work fuel does in each working cycle can be obtained by taking the（）．
A．precautions
B．rpm
C．indicator cards
D．B and C
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答案解析：无
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上一篇：The working cycle of a four-stroke diesel engine consists of four events( )（）（1）compression
（2）expansion
（3）exhaust
（4）suctionThe correct sequence is
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