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单选题
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


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