题目内容

19. Marc Edwards, an engineering professor, has been appointed by the Michigan Governor to deal with the water crisis in Flint

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20. Marc Edwards formed a water study team and spent a large amount of his own money on his research and investigation.

以下不属于预处理设施的是：

A. 沉砂池
B. 化粪池
C. 曝气生物滤池
D. 紫外杀菌处理设备

以下不属于挺水植物的是（）

A. 荷花
B. 睡莲
C. 芦苇
D. 香蒲

（）的水力负荷大和污染负荷大。

A. 表面流湿地
B. 潜流式湿地