多项选择题
A.20MnV B.60Si2Mn C.40CrMn0.8 D.GCr9
A.ZCuSn10pB1 B.QSn4-3 C.ZAlCu5Mn D.ZCuSn5PB5Zn5
A.08F B.45 C.40CrNi D.15
A.ZHT B.HT C.ZG D.RuT
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