问题描述：
[单选]
The conclusion that mechanical efficiency is always（）100 percent is correct．
A．small than
B．more than
C．little than
D．less tha
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答案解析：无
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上一篇：The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the（）through which oil is transmitted up the rod to lubricate the small end．
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