单项选择题
下列（）钢是优质碳素钢。
A.ws=0.052%，wp=0.042%
B.ws=0.048%，wp=0.042%
C.ws=0.038%，wp=0.038%
D.ws=0.052%，wp=0.04%
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单项选择题
A.ws=0.052%，wp=0.042%
B.ws=0.048%，wp=0.042%
C.ws=0.038%，wp=0.038%
D.ws=0.052%，wp=0.04%
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