单选题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?（）Amain bearing shellsBmain bearingCsteelDbearing metal
单选题
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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