A.centrifuging
B.pressurizing
C.atomization
D.igniting
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A.no oxygen is needed
B.oxygen is necessary
C.oxygen is given off
D.no gas is produced
A.in the presence of oxygen
B.without oxygen
C.in the presence of nutrition
D.without nutrition
A.the bacteria
B.oxygen
C.oxidizing function
D.agitation function
A.oxygenating
B.oxidizing
C.deoxygenating
D.proportioning
A.any requirement appointed by the Officer
B.the most suitable requirement
C.the most stringent requirement
D.no requirement
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（） is not installed on the main switchboar.
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