單項(xiàng)選擇題When the ships is going to enter into the harbor,（）.

A.change from diesel oil to heavy fuel oil for mail engine
B.pump out bilge water
C.change sea chest form lower level one to high level one
D.test emergency generator


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1.單項(xiàng)選擇題Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

A.a variable-speed AC generator
B.a fixed-speed AC generator
C.an air blower
D.a DC generator

3.單項(xiàng)選擇題With（） the engine need not to be aligned with reduction gears or propeller shaft.

A.Diesel engine propulsion
B.Diesel electric propulsion
C.Steam engine propulsion
D.Gas turbine propulsion

4.單項(xiàng)選擇題Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.

A.a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine
B.a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine
C.two medium-speed, turbocharged, four-stroke diesel engines
D.a variable-speed AC generator

5.單項(xiàng)選擇題Propulsion of the vast majority of contemporary merchant ships (especially containerships and VLCCs) utilizes（） as prime mover.

A.gas turbine
B.diesel engine
C.steam engine
D.gasoline engine