问题描述：
[单选]
The main bearing metal is a lining（）．
A．inside the bearing
B．outside the bearing
C．covering the crankshaft
D．none of the above
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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 main bearing shells are made of steel with a lining of bearing metal which may be white metal， copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above？
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