单选题When are fore and aft draft readings required to be entered in the unofficial logbook of a ship? （）AOnce a dayBOnce a weekCPrior to getting underwayDOnly when entering waters of different density
单选题
When are fore and aft draft readings required to be entered in the unofficial logbook of a ship? （）
A
Once a day
B
Once a week
C
Prior to getting underway
D
Only when entering waters of different density
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