单项选择题

A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge（）

A.by opening the separator manually
B.by separating the lower part from the upper part automatically
C.by separating the upper part from the lower part automatically
D.continuously

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单项选择题

“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）

A.a centrifuge
B.an electric motor
C.a bowl assembly
D.a driving motor

单项选择题

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

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

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