单项选择题
A.α-Fe,铜 B.α-Fe,钒 C.γ-Fe,铜 D.γ-Fe,钒
A.Ⅲ+Ⅴ+Ⅵ B.Ⅱ+Ⅳ+Ⅴ+Ⅵ C.Ⅵ D.Ⅱ+Ⅲ+Ⅴ
A.Ⅰ+Ⅲ+Ⅴ B.Ⅱ+Ⅳ+Ⅴ C.Ⅱ+Ⅳ+Ⅵ D.Ⅰ+Ⅲ+Ⅴ