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Which is false about engine trials?（）
A:engine trails should be done after finishing the operation of turning the engine with the turning gear and starting the engine on air briefly
B:in the operation of engine trails, the main engine should be running in low-speed
C:As to the ship equipment with twin main engine, engine trials should be done with one engine ahead and another engine astern at the same time
D:the order “engine trials” should be given by the bridge

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出自：海船船员证

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