单项选择题
A.0.5mg/LB.1mg/LC.1.5mg/LD.2mg/L
A.1~3dB.3~5dC.3~7dD.7~10d
A.藻类B.累枝虫C.豆形虫D.线虫
A.1000~1500mg/LB.1500~2000mg/LC.2000~3000mg/LD.3000~4000mg/L
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