單項(xiàng)選擇題

The treatment of the fuel oils involves storage, heating, filtering and（）

A.centrifuging
B.pressurizing
C.atomization
D.igniting

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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