單項(xiàng)選擇題

Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）

A.the plant should be prohibited to supplying air
B.the plant should work at intervals
C.the plant should be added disinfector in time
D.we should check strength of activated sludge, ivory-white color is best

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單項(xiàng)選擇題

Disinfector in the sewage biological treatment plant usually is （）

A.chlorine water
B.ozone
C.hypo-calcium chloride
D.calcium oxide

單項(xiàng)選擇題

Before marine sewage treatment plant works （） should be filled with fresh water.

A.deposition chamber
B.oxidation pool
C.disinfection chamber
D.all chamber

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Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）

你可能感興趣的試題

Disinfector in the sewage biological treatment plant usually is （）

Before marine sewage treatment plant works （） should be filled with fresh water.