单项选择题
A.all required documents and publications may have to be produced B.licensed GMDSS radio operators may be required to demonstrate equipment competencies C.all required equipment must be fully operational D.All of the above
Class C EPIRBs are（）.A.manually activated and operate o...
单项选择题Class C EPIRBs are（）.
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
