[单选题]

普通钢的元素含量S≤()%,P≤()%。

A.0.050,0.045

B.0.045,0.050

C.0.035,0.045

D.0.045,0.035

参考答案与解析:

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普通钢的元素含量S≤()%,P≤()%。