... 二级微动控制 dual-ratio control; 二级污水处理 secondary sewage treatment; 二级系统 level two; ...
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一个二级污水处理系统,在较小的社区。
A secondary sewage treatment system used in smaller communities.
一个二级污水处理系统,用于在较大的社区。
A secondary sewage treatment system used in larger communities.
目前,对城市污水的处理主要采用活性污泥法即兴建城市二级污水处理厂。
Presently, active sludge method, or the establishment of secondary sewage treatment plants has been mainly adopted to treat urban sewage.
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