试题与答案

某厂废水处理采用有回流的加压溶气气浮池,池宽3.5m,每日处理废水量3600m3,每

题型:单项选择题

题目:

某厂废水处理采用有回流的加压溶气气浮池,池宽3.5m,每日处理废水量3600m3,每日回流加压溶气的水量1638m3,分离区停留时间20min,分离区下降流速2mm/s,则该气浮池分离区的长度应为()。

A.7.9m

B.9.6m

C.8.7m

D.6.5m

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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27. A. change          B. repair          C. ring           D. shake

28. A. now and then    B. day and night    C. up and down    D. over and over

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39. A. stand           B. accept          C. know           D. share

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49. A. point         B. cause           C. need          D. law

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