单项选择题

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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单项选择题

（）with various arrangements of barrels are the usual mooring equipment used on board ships.

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

单项选择题

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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（）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