试题与答案

下列()是热轧光圆强度等级代号。 A.HRB335 B.HRB500 C.CRB55

题型:单项选择题

题目:

下列()是热轧光圆强度等级代号。

A.HRB335

B.HRB500

C.CRB550

D.HPB235

答案:

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