Most often （） is attached to the engine-propeller shaft for efficient electric power generation.<br>A:a variable-speed AC generator<br>B:a fixed-speed AC generator<br>C:an air blower<br>D:a DC generator

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

出自：海船船员证

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