单项选择题
A.间隙时间 B.轧制节奏 C.轧制周期
A.1500_3500mm B.1000_4500mm C.1500_4500mm
A.1500_4500mm B.1000_4500mm C.1500_3500mm
A.266mm B.180mm C.270mm
微信扫一扫,加关注免费搜题