单项选择题
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
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单项选择题
A.0.050,0.045
B.0.045,0.050
C.0.035,0.045
D.0.045,0.035
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