（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.<br>A:anaerobic bacteria<br>B:aerobic bacteria<br>C:air bubbles<br>D:disinfection chemicals

（）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

出自：海船船员证

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