单选题When is the density of the water required to be logged in the logbook of a ship?（）AAny time the vessel moves from water of one density into waters of a different densityBPrior to getting underway when the vessel is floating in fresh or brackish waterCOnly when the vessel moves from fresh water into salt waterDThe density of the water is not required to be logged in the unofficial logbook
单选题
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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