单选题
When is the density of the water required to be logged in the logbook of a ship?（）
发布日期：2021-03-22
Any time the vessel moves from water of one density into waters of a different density
Prior to getting underway when the vessel is floating in fresh or brackish water
Only when the vessel moves from fresh water into salt water
The density of the water is not required to be logged in the unofficial logbook
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