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【单选题】
镁、铝、铜三种金属粉末的混合物，加入过量盐酸充分反应，过滤后向滤液中加入过量烧碱溶液，再过 滤，滤液中存在的离子有 [ ]A.
AlO 2 -
B.
Cu 2+
C.
Al 3+
D.
Mg 2+
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