题目内容：
城市污水二级处理目的是消除（）
A.悬浮物
B.重金属
C.病原微生物
D.耗氧有机物
参考答案：
选择题：城市污水二级处理目的是消除（）
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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