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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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