城市污水处理厂外排尾水渠设置紫外线灯照射设施的作用是()。
A.增加外排尾水中溶解氧含量
B.使水中致病微生物死亡或灭活
C.进一步处理COD
D.脱除水中的氨
参考答案:B
Can you think of some cases______drivers obviously knew the traffic rules but didn’t obey them?
A.why
B.where
C.as
D.which
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