There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.<br>A:engaged in fishing in a traffic lane<br>B:servicing a submarine cable<br>C:towing another<br>D:engaged on pilotage duty

There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic separation schemes. One of these is a vessel（）.
A:engaged in fishing in a traffic lane
B:servicing a submarine cable
C:towing another
D:engaged on pilotage duty

出自：海船船员证

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