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