单选题（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.Aanaerobic bacteriaBaerobic bacteriaCair bubblesDdisinfection chemicals
单选题
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A
anaerobic bacteria
B
aerobic bacteria
C
air bubbles
D
disinfection chemicals
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