When anaerobic bacteria convert the sewage to an inert sludge,（）<br>A:no oxygen is needed<br>B:oxygen is necessary<br>C:oxygen is given off<br>D:no gas is produced

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

出自：海船船员证

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