A passenger vessel is required to have a supervised patrol when（）.<br>A:there are passengers berthed on board<br>B:navigating in excess of eight hours<br>C:the vessel has substantial wood in its construction<br>D:there is no automatic fire-detection system installed

A passenger vessel is required to have a supervised patrol when（）.
A:there are passengers berthed on board
B:navigating in excess of eight hours
C:the vessel has substantial wood in its construction
D:there is no automatic fire-detection system installed

出自：海船船员证

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