单项选择题
A.Si Mn B.MO Cr C.Mn P D.S Ti
A.热裂纹和再热裂纹 B.冷裂纹。热裂纹和再热裂纹 C.延迟裂纹 D.冷裂纹。再热裂纹
A.20G B.16Mn C.Q235 D.15CrMO
A.16Mn钢 B.低碳钢 C.Q235 D.20g
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