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【多选题】
依据处理对象与处理程度,污水处理有三个级别;下列叙述正确的是( )。A.
一级处理主要用物理方法，以去除粗大的固形物
B.
二级处理常采用生物处理或生化处理
C.
二级处理主要是去除水体中的有机污染物
D.
三级处理后污染物的去除率达到98%以上
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