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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