單項(xiàng)選擇題

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

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單項(xiàng)選擇題

Class A EPIRBs are required on（）.

A.self-propelled，inspected vessels
B.towing vessels
C.recreational vessels
D.uninspected passenger vessels

單項(xiàng)選擇題

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

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