题目：
常用的选矿方法有：重力选矿法、磁选法、（）。
A、优选法
B、电选法
C、浮选法
D、筛选法
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
常用的选矿方法有：重力选矿法、磁选法、（）。A、优选法B、电选法C、浮选法D、筛选法
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