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When is the density of the water required to be logged in the logbook of a ship?（）
A:Any time the vessel moves from water of one density into waters of a different density
B:Prior to getting underway when the vessel is floating in fresh or brackish water
C:Only when the vessel moves from fresh water into salt water
D:The density of the water is not required to be logged in the unofficial logbook

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出自：海船船员证

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