单项选择题
A.2 B.4 C.6 D.8
A.CoMo B.NiMo C.Mn D.Co
A.0.1-0.2Mpa B.0.2-0.4Mpa C.0.4-0.6Mpa D.0.6-0.7Mpa
A.16 B.13 C.12 D.15
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