Which is false about engine trials?（）

Aengine trails should be done after finishing the operation of turning the engine with the turning gear and starting the engine on air briefly
Bin the operation of engine trails, the main engine should be running in low-speed
CAs 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
Dthe order “engine trials” should be given by the bridge

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参考解析：

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