单项选择题
A.orbiting satellites in space B.commercial radio stations C.private，commercial，and military aircraft D.ordinary radio stations
All self-propelled vessels on an international voyage m...
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
A vessel operating outside of coastal waters must carry...
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（）.
A.does not have berthing facilities B.has berthing and galley facilities C.is a workboat and her mother ship carries an EPIRB D.None of the above are correct
A major advantage of the NAVTEX system when compared to...
单项选择题A major advantage of the NAVTEX system when compared to other systems is that（）.
A.the information can be received on an ordinary FM radio B.warnings are printed out for reading when convenient C.broadcasts are at scheduled times D.a low frequency band is used for long distance transmission
