A.碳 B.氧 C.硫 D.釩
A.冷軋帶肋鋼筋 B.冷軋扭鋼筋 C.預(yù)應(yīng)力混凝土用鋼筋 D.預(yù)應(yīng)力混凝土用螺紋鋼筋
A.GB/T228.1 B.JGJ/T27 C.JGJ107 D.YB/T081