单项选择题
A.Rm≥300Mpa B.Rm≤300Mpa C.Rel≥300Mpa D.Rel≥400Mpa
A.9% B.0.9% C.90% D.1%
A.1Cr18Ni9 B.GCr15 C.40Cr D.20CrMnTi
A.T10 B.Cr12Mn C.ZGMn13 D.GCr15
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