單項選擇題

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

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A.orbiting satellites in space
B.commercial radio stations
C.private，commercial，and military aircraft
D.ordinary radio stations

A.One approved Class A EPIRB
B.Two approved Class A EPIRBs
C.One approved Class B EPIRBs
D.Two approved Class B EPIRBs