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通常,在活性污泥培养和驯化阶段中,原生动物种类的出现和数量的变化往往会按一定的顺序。在运行初期阶段曝气池中常出现大量( )。

A、肉足虫和鞭毛虫 

B、鞭毛虫和钟虫 

C、鞭毛虫和轮虫 

D、钟虫和轮虫 

时间：2021-09-01 16:46 关键词：青书学堂平顶山学院环境生态工程环境监测(专升本)

答案解析

A

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