单项选择题
The treatment of the fuel oils involves storage, heating, filtering and（）
A.centrifuging
B.pressurizing
C.atomization
D.igniting
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单项选择题
When anaerobic bacteria convert the sewage to an inert sludge,（）
A.no oxygen is needed
B.oxygen is necessary
C.oxygen is given off
D.no gas is produced -
单项选择题
Bacteria which live are said to be aerobic（）
A.in the presence of oxygen
B.without oxygen
C.in the presence of nutrition
D.without nutrition -
单项选择题
It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）
A.the bacteria
B.oxygen
C.oxidizing function
D.agitation function
