Before marine sewage treatment plant works （） should be filled with fresh water.<br>A:deposition chamber<br>B:oxidation pool<br>C:disinfection chamber<br>D:all chamber

Before marine sewage treatment plant works （） should be filled with fresh water.
A:deposition chamber
B:oxidation pool
C:disinfection chamber
D:all chamber

出自：海船船员证

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