单选题:重选法与浮选法的不同特点是,重选法是(  )。

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题目内容:
重选法与浮选法的不同特点是,重选法是(  )。 A.采用泡沫作为分选介质
B.用机械作用分离不同密度的颗粒
C.选前要磨矿分级
D.选后要脱水
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