A.enable SAR operations to start with minimum delay
B.give facilities to marine communication
C.reduce sharply the chances of ship’s sinking
D.both A and C
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A.occasionally
B.accidentally
C.often
D.usually
A.keep
B.kept
C.are keeping
D.have kept
A.has made
B.make
C.has been made
D.is making
A.When the distress alert is sounded
B.When the emergency equipment is switching on
C.When the general emergency alarm is sounded
D.When the distress broadcast is sounded
A.When
B.Where
C.how
D.that
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
COSPAS-SARSAT is intended to be used for（）.
The advantage of geostationary satellites is（）.
Please use（）for（）.
The rescue coordination center may（）on stations which interfere with traffic.
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.
All coast radio stations（）DSC installed for VHF and HF.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
Ship-to-ship distress alerting should be conducted by（）.
By using（）system a ship can send a distress message and know with certainty it will be received.