单选题Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?（）Athe plant should be prohibited to supplying airBthe plant should work at intervalsCthe plant should be added disinfector in timeDwe should check strength of activated sludge, ivory-white color is best
单选题
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
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