单项选择题
A.≤0.06%B.>0.06%〜0.10%C.>0.10%〜0.20%D.>0.20%〜0.40%
A.合金调质钢B.合金渗透钢C.合金耐热钢D.合金特殊钢
A.HRC40B.HRC60C.HRC65-70D.HRC30
A.锻造型钢B.冷弯型钢C.铸造型钢D.挤压型钢
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