单选题In order to culture and propagate enough bacteria to treat the body and galley wastes（）Aa new bacteria colony should be put into the plant in advanceBthe disinfection chemicals should be always usedCthe air blower should be started and keep running in advanceDthe nutrient for bacteria should put into plant in advance
单选题
In order to culture and propagate enough bacteria to treat the body and galley wastes（）
A
a new bacteria colony should be put into the plant in advance
B
the disinfection chemicals should be always used
C
the air blower should be started and keep running in advance
D
the nutrient for bacteria should put into plant in advance
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