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While the Pilot is maneuvering the vessel to a dock，what is the PRIMARY responsibility of the watch officer?（）
A:Insure that helm and throttle orders given by the Pilot are correctly executed
B:Judge the appropriateness of the Pilot's orders and countermand them if necessary
C:Supervise the signaling and flag etiquette
D:Record the bells and their times in the bell book

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出自：海船船员证

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