On which vessels are the officers and deck crew allowed to operate under a two-watch system on voyages of less than 600 miles? （）<br>A:Towing vessels<br>B:Offshore supply vessels<br>C:Barges，when manned<br>D:All of the above

On which vessels are the officers and deck crew allowed to operate under a two-watch system on voyages of less than 600 miles? （）
A:Towing vessels
B:Offshore supply vessels
C:Barges，when manned
D:All of the above

出自：海船船员证

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