A.成對(duì)軋制 B.長(zhǎng)棒料軋制 C.對(duì)稱力軋制 D.單根軋制
A.GCr15 B.9CrSi C.Cr12MoV D.W18Cr4V
A.50鋼 B.55鋼 C.5CrMnMo D.5CrNiMo