A.cranes
B.winch barrel
C.capstans
D.windlass
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A.cranes
B.winches
C.capstans
D.windlass
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
A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals
A.deoxygenating
B.oxygenating
C.chemicalizing
D.disinfecting
A.deoxygenating
B.extended aeration
C.oxygenating
D.bubbling air
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