The main bearing shells are made of steel with a lining of bearing metal which may be whit

The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloyWhat is the meaning of “which” in the sentence above？

A.main bearing shells

B.main bearing

C.steel

D.bearing metal

请帮忙给出正确答案和分析，谢谢！

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