多项选择题
A.GCr15 B.9CrSi C.Cr12MoV D.W18Cr4V
A.50钢 B.55钢 C.5CrMnMo D.5CrNiMo
A.W6Mo5Cr4V2A1 B.5W2Cr4V2 C.40Cr D.42CrMo
A.9CrSi B.Cr12MoV C.W18Cr4V D.40Cr
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