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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.
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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：
以下不属于挺水植物的是（ ）
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