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方程【图片】至少有一个不超过4的根A.
正确
B.
错误
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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】IEEE 通信协议是由 IEEE802 委员会制定的 , 它把数据链路层分为了 2 个子层 , 即逻辑链路控制层和 控制层。
【单选题】Anaerobic wastewater treatment uses ______ agents to remove impurities.
A.
biological
B.
physical
C.
chemical
D.
medical
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