单项选择题
A.Si.Mn B.Cr.Ni C.Cr.Mo
A.S≤0.035%P≤0.035% B.S≤0.05%P≤0.035% C.S≤0.06%P≤0.06%
A.>5% B.<10% C.17%
A.饱和 B.不饱和 C.过饱和
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