17.Flint residents trust Marc Edwards instead of the company the city wanted to hire to test the city’s water.
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18. The Environmental Protection Agency provided misinformation about the water problem to the mayor of Flint, who came on TV to show the water was safe.
19. Marc Edwards, an engineering professor, has been appointed by the Michigan Governor to deal with the water crisis in Flint
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