A.COSPAS-SARSAT
B.ground receiving stations
C.spacecraft
D.satellite SAR instrument
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A.anywhere in the world
B.at sea
C.in the air
D.ashore
A.1982
B.1980
C.1984
D.1988
A.alerting
B.on-scene communication
C.safety information
D.general communication
A.sometimes
B.all times
C.never
D.partly
A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The priority of EGC messages is classified by（）.
On-scene communications will normally take place between（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
The advantage of geostationary satellites is（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
Radio beacon can be activated（）in case of distress.
What following is not among the function of SOLAS ships?（）
All coast radio stations（）DSC installed for VHF and HF.