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While on watch at sea you must maintain a proper lookout at all times. You are on a 200-foot cargo vessel with an unobstructed view astern from the steering position. The vessel is being hand-steered during daylight hours in good visibility and clear of any navigational hazards. The lookout may be（）.
A:the helmsman
B:the officer on watch
C:either A or B
D:neither A nor B

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出自：海船船员证

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