單項選擇題“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


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1.單項選擇題The treatment of the fuel oils involves storage, heating, filtering and()

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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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