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【单选题】
当量直径>（）mm的土壤孔隙称为通气孔隙A.
0.02
B.
0.02--0.002
C.
0.002
D.
0.001
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【单选题】下面关于活性污泥的叙述中错误的是( )。
A.
活性污泥法系统实质上是自然界水体自净的人工模型,是经人工强化的模型
B.
活性污泥是活性污泥处理体系中的主体作用物质,在活性污泥中栖息着具有强大生命力的微生物种群
C.
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D.
活性污泥由四部分物质组成:具有代谢功能活性的微生物群体(Ma);微生物(主要是细菌)内源代谢、自身氧化的残留物(Me);由原污水挟入的难为细菌降解的惰性有机物质(Mi);由污水挟入的无机物质(Mii)
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