When are fore and aft draft readings required to be entered in the unofficial logbook of a ship? （）<br>A:Once a day<br>B:Once a week<br>C:Prior to getting underway<br>D:Only when entering waters of different density

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

出自：海船船员证

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