单项选择题
All self-propelled vessels on an international voyage must be equipped with how many Emergency Position Indicating Radiobeacons (EPIRB)（）?
A.One approved Class A EPIRB B.Two approved Class A EPIRBs C.One approved Class B EPIRBs D.Two approved Class B EPIRBs
单项选择题 A vessel operating outside of coastal waters must carry an automatically activated Emergency Position Indicating Radio Beacon (EPIRB) if she（）.
单项选择题 A major advantage of the NAVTEX system when compared to other systems is that（）.
单项选择题 A Class S EPIRB is a（）.
