题目内容

活性污泥法处理工艺主要由（）组成。

A. 沉淀池、曝气池、曝气与空气扩散系统和污泥回流系统
B. 二次沉淀池、曝气池、曝气与空气扩散系统和污泥回流系统
C. 曝气池、曝气与空气扩散系统、二次沉淀池和污泥回流系统
D. 曝气池、二次沉淀池、曝气与空气扩散系统和污泥回流系统

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