单项选择题
A.manually activated and operate on maritime (VHF) channels B.automatically activated and operate on maritime (VHF) channels C.manually operated and detected by satellite D.automatically operated and detected by satellite
Class A EPIRBs are required on（）.A.self-propelled，inspe...
单项选择题Class A EPIRBs are required on（）.
A.self-propelled，inspected vessels B.towing vessels C.recreational vessels D.uninspected passenger vessels
CATEGORY A EPIRB’s transmit on frequencies that are mon...
单项选择题CATEGORY A EPIRB’s transmit on frequencies that are monitored by（）.
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
