单项选择题
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals
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相关考题
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单项选择题
The extended aeration process consists of （） the liquor either by bubbling air through it or by agitating the surface.
A.deoxygenating
B.oxygenating
C.chemicalizing
D.disinfecting -
单项选择题
A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）
A.deoxygenating
B.extended aeration
C.oxygenating
D.bubbling air -
单项选择题
Which of the following would not be burnt in an incinerator on board?（）
A.waste oil
B.waste cloths
C.Oil rags
D.Waste food
