單項選擇題
A.the port of destination B.the next port of call C.the port of arrival D.the last port of call
A.VHF communications are basically line of sight B.the air is more dense the higher you go C.salt water is a poor conductor of sound D.sea water absorbs the radiated energy
A.Mayday,Mayday,Mayday B.Pan,Pan,Pan C.Security,Security,Security D.Lights out,Lights out,Lights out
A.to get the engine ready B.to respond to the engine C.to maneuver the engine D.to change the engine
A.due B.because of C.because D.since
A.persist B.persists C.to persist D.persisted
A.pay out B.make fast C.shorten D.hold on
A.calls B.called C.calling D.call
A.telephone B.telegraph C.telex D.VHF
A.calls at B.has called at C.call at D.will call at
A.Calling frequency B.Distress frequency C.Urgency frequency D.Working frequency