A.every two years
B.every three years
C.every year
D.every four years
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A.the radio regulations
B.the technical terms and definitions
C.how to operate the GMDSS SES equipment
D.Maritime Communications
A.alphabetical
B.figure
C.name of stations
D.series
A.radio direction-finding apparatus
B.DSC
C.NAVTEX
D.EPIRB
A.871
B.872
C.873
D.874
A.routine
B.distress
C.urgency
D.safety
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All coast radio stations（）DSC installed for VHF and HF.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
By using（）system a ship can send a distress message and know with certainty it will be received.
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.
（）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.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
COSPAS-SARSAT is intended to be used for（）.