问题描述：
[单选]
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？
A．main bearing shells
B．main bearing
C．steel
D．bearing metal
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答案解析：无
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上一篇：The main bearing shells often have a thin（）of lead or indium to provide a layer giving protection against corrosion．
下一篇：The main bearing metal is a lining（）．
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