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【简答题】
简述气升式发酵罐的工作原理。
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【单选题】One disadvantage of reusing treated wastewater is .
A.
its cost is too high
B.
its productivity is too low
C.
the resulting water is not ultra-pure
D.
the method is not logical
【简答题】Cleaning wastewater also generates byproduct called _______.
【单选题】What is the main problem caused by the use of wastewater for irrigation?
A.
Rivers and lakes nearby will gradually become contaminated.
B.
It will drive producers of chemical fertilizers out of business.
C.
Farmers and consumers may be affected by harmful bacteria.
D.
It will make the farm produce less competitive on the market.
【简答题】Wastewater is _____ that flows from the community.
【简答题】根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两 项为多余选项。 Handwriting can make or break the first impression . If your handwriting is difficult for others to read, you will sometimes feel embarrassed._51___. It need...
【单选题】Anaerobic wastewater treatment uses ______ agents to remove impurities.
A.
biological
B.
physical
C.
chemical
D.
medical
【简答题】Wastewater chemical treatment
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