A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message
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A.satellite and terrestrial communication systems
B.only navigational and alerting systems
C.just MSI system and locating system
D.SAR co-ordination system
A.NAVTEX
B.EGC
C.HF-telex
D.all of above
A.can be overcome by using traditional techniques
B.cannot be overcome by satellite system
C.can be overcome by satellite and digital techniques
D.cannot be tackled by any modern system
A.business opportunity
B.good-quality radio telephone conversations
C.telex service
D.both B and C
A.a fixed area or Navarea in any ocean region
B.a Navarea or weather forecast area
C.the designated area or given geographic position
D.anywhere of the world
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（）will form the basis for distress alerting and safety calling.
COSPAS-SARSAT is intended to be used for（）.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Radio communication（）for many years and helps to save tens of thousands of lives.
The vessel has stayed in port for seven days because she needs（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.