Logbooks are used to record the events occurring when（）.<br>A:the ship is in a harbor<br>B:the ship is at anchorage<br>C:the ship is underway<br>D:all of the above

Logbooks are used to record the events occurring when（）.
A:the ship is in a harbor
B:the ship is at anchorage
C:the ship is underway
D:all of the above

出自：海船船员证

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