單項(xiàng)選擇題The （） is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A.cranes
B.winch barrel
C.capstans
D.windlass


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1.單項(xiàng)選擇題（）with various arrangements of barrels are the usual mooring equipment used on board ships.

A.cranes
B.winches
C.capstans
D.windlass

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

A.anaerobic bacteria
B.aerobic bacteria
C.air bubbles
D.disinfection chemicals

4.單項(xiàng)選擇題The extended aeration process consists of （） the liquor either by bubbling air through it or by agitating the surface.

A.deoxygenating
B.oxygenating
C.chemicalizing
D.disinfecting

5.單項(xiàng)選擇題A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）

A.deoxygenating
B.extended aeration
C.oxygenating
D.bubbling air