题目内容

悬浮物在沉降过程中,质量、沉速随深度的增加而增大的沉淀类型是()。

A. 自由沉降
B. 絮凝沉降
C. 拥挤沉降
D. 压缩沉降

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采用稀释与接种法测定BOD5时,水样在25℃±1℃的培养箱中培养5d,分别测定样品培养前后的溶解氧,二者之差即为BOD5值。

A. 正确
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