某城市污水处理厂规模为10000m3/d,总变化系数1.58,采用两组氧化沟工艺,由

题型:单项选择题

问题:

某城市污水处理厂规模为10000m3/d,总变化系数1.58,采用两组氧化沟工艺,由于该污水处理厂经常出现污泥膨胀,拟增设厌氧选择池控制污泥膨胀。该厌氧选择池的有效容积为()。

A.600m3

B.500m3

C.400m3

D.300m3

考点:注册公用设备工程师给水排水专业排水工程专业
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4.  The earth is one of the sun's           .

5.  —Who is the first ______of the USA?

     —Washington.

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7.  Smoking is not allowed in ______ places, such as shopping malls and hospital.

8.  There are many new words and ______ in the passage.  I can't understand it.

9.  We should use fewer and fewer ______ bags to protect the environment.

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D.左侧卧位

E.膝胸卧位

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A.以人为本,人定胜天

B.盛世滋丁,永不加赋

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B.肯氏一类和二类的病例

C.咬合紧的病例

D.松动基牙或牙冠外形差的基牙

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