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When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be（）
A:disengaging the clutch firstly, then stopping the main engine
B:stopping the main engine firstly, then disengaging the clutch
C:stopping the cooling water pump firstly, then stopping the main engine
D:stopping the main engine and disengaging the clutch at the same time

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出自：海船船员证

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