单项选择题
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
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相关考题
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单项选择题
In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.
A.greater
B.better
C.smaller
D.less -
单项选择题
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 -
单项选择题
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
