单项选择题
A.高纯铝 B.含铜的铝合金 C.铝-镁系 D.铝-锰系
A.Cr18%、Ni8%、Mn2% B.Cr12%、Ni3%、Mn10% C.Cr18%、Ni3%、Mn2% D.Cr12%、Ni8%、Mn4%
A.1060 B.5083 C.6063 D.ZL102