单项选择题
A.ZL102 B.ZL202 C.ZL301 D.ZL402
A.GCr15 B.Cr12MoV C.1Cr13 D.1Cr18Ni9Ti
A.GCr15 B.Cr12 C.1Cr13 D.1Cr18Ni9Ti
A.淬火+低温回火 B.淬火+中温回火 C.调质 D.调质后表面淬火
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