单选题Most often () is attached to the engine-propeller shaft for efficient electric power generation.Aa variable-speed AC generatorBa fixed-speed AC generatorCan air blowerDa DC generator

单选题
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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