单选题What type of electric motor is most commonly used on board ship?（）Anon-synchronous electric motorBsynchronous electric motorCfully enclosed electric motorDwatertight electric motor
单选题
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
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解析：
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