Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）<br>A:the plant should be prohibited to supplying air<br>B:the plant should work at intervals<br>C:the plant should be added disinfector in time<br>D:we should check strength of activated sludge, ivory-white color is best

Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）
A:the plant should be prohibited to supplying air
B:the plant should work at intervals
C:the plant should be added disinfector in time
D:we should check strength of activated sludge, ivory-white color is best

出自：海船船员证

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