单项选择题
A.耐磨铸铁 B.抗磨白口铸铁 C.抗磨球铁 D.耐热球铁
A.硫≤0.055%，磷≤0.045% B.硫≤0.040%，磷≤0.040% C.硫≤0.030%，磷≤0.035% D.以上都不是
A.2Cr13 B.1Cr18Ni9Ti C.Cr17 D.35Si2Mn2HOV
A.40# B.20Cr C.B3 D.T12
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