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【单选题】In sewage treatment, the term maceration refers to the process of ______.
A.
breaking up solid matter into fine particles
B.
precipitating non-decomposed waste in a collection tank
C.
chemically adjusting the sewage ph to 7.0
D.
eliminating bacterium coli from the sewage
【判断题】幻灯片主题是指PowerPoint 2016提供的颜色、字体和效果搭配的模板,应用这些主题模板,可以快速美化幻灯片的版式,使演示文稿中各幻灯片拥有统一的风格。
A.
正确
B.
错误
【单选题】____ are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A.
anaerobic bacteria
B.
aerobic bacteria
C.
air bubbles
D.
disinfection chemicals
【简答题】The processing of sewage(污水) requires considerable amounts of electricity. Many sewage treatment plants in the U.S. have become self-sufficient by using the methane gas (沼气)given off by sewage.
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