A.HRB400為其牌號(hào) B.HRB400為其等級(jí) C.屈服強(qiáng)度特征值為400Mpa D.交貨檢驗(yàn)屈服強(qiáng)度的最小值為400MPa
A.7.5% B.9% C.9.5% D.10%
A.5% B.8% C.10% D.12%