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【单选题】
金属Ti(钛)是一种具有许多优良性能的较为昂贵的金属，钛和钛合金被认为是21世纪的重要金属材料。某化学兴趣小组在实验室探究Ti、Mg、Cu的活动性顺序。他们在相同温度下，取大小相同的三种金属薄片，分别投入到等体积等浓度的足量稀盐酸中，观察现象如表 下列有金属的说法正确的是 [ ]A.
三种金属的活动性由强到弱的顺序是Ti、Mg、Cu
B.
若钛粉中混有Mg，提纯Ti时可用稀盐酸除去Mg
C.
用Ti从CuSO 4 溶液中置换出Cu是工业制取Cu的很好途径
D.
Cu和稀盐酸不发生化学反应
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