What type of electric motor is most commonly used on board ship?（）<br>A:non-synchronous electric motor<br>B:synchronous electric motor<br>C:fully enclosed electric motor<br>D:watertight electric motor

What type of electric motor is most commonly used on board ship?（）
A:non-synchronous electric motor
B:synchronous electric motor
C:fully enclosed electric motor
D:watertight electric motor

出自：海船船员证

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