单项选择题
A.HRB B.HRBF C.HFB D.HPB
A.HRB400为其牌号 B.HRB400为其等级 C.屈服强度特征值为400Mpa D.交货检验屈服强度的最小值为400MPa
A.7.5% B.9% C.9.5% D.10%
A.5% B.8% C.10% D.12%
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