A.NAVTEX
B.EGC
C.HF-telex
D.all of above
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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
A.automatically suppressed
B.finished by the operator
C.manually suppressed
D.done again
A.Ship stations
B.Coast stations
C.NCSs
D.NCC
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Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
We consider（）send a helicopter with medical facilities to the distress area.
The priority of EGC messages is classified by（）.
On-scene communications will normally take place between（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
The advantage of geostationary satellites is（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
COSPAS-SARSAT is intended to be used for（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
The vessel has stayed in port for seven days because she needs（）.