单项选择题
A.20Cr B.20CrMnTi C.12Cr2Ni4A D.9SiCr
A.18Cr2Ni4WA B.12Cr2Ni4A C.15CrMn2SiMoA D.20Cr
A.5% B.10% C.15% D.20%
A.0.%~0.8% B.0.8%~0.9% C.0.9%~1.0% D.1.15%左右
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