A.business opportunity
B.good-quality radio telephone conversations
C.telex service
D.both B and C
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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
A.automatically suppressed
B.finished by the operator
C.manually suppressed
D.done again
A.Ship stations
B.Coast stations
C.NCSs
D.NCC
A.NBDP
B.EGC receiver
C.NBDP or both
D.EGC receiver or both
A.the ship has received the DSC distress call on a HF frequency
B.the coast station concerned has not acknowledged it within 5 minutes
C.the ship will take command of search and rescue in 5 minutes
D.A and B
最新試題
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.
The vessel has stayed in port for seven days because she needs（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Ship-to-ship distress alerting should be conducted by（）.
The priority of EGC messages is classified by（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
SOLAS ships shall be equipped with（）.
The rescue coordination center may（）on stations which interfere with traffic.
Radio communication（）for many years and helps to save tens of thousands of lives.