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单项选择题
A.cranes
B.mooring barrel
C.capstans
D.cable lifter
单项选择题
A.popular
B.common
C.in lead position
D.uncommon
单项选择题
A.spur geared
B.screw geared
C.worm geared
D.belt driven
单项选择题
A.cranes
B.windlass
C.capstans
D.mooring winches
单项选择题
A.cranes
B.winch barrel
C.capstans
D.windlass
单项选择题
A.cranes
B.winches
C.capstans
D.windlass
单项选择题
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
单项选择题
A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals
单项选择题
A.deoxygenating
B.oxygenating
C.chemicalizing
D.disinfecting
单项选择题
A.deoxygenating
B.extended aeration
C.oxygenating
D.bubbling air