A.the radio regulations
B.the technical terms and definitions
C.how to operate the GMDSS SES equipment
D.Maritime Communications
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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
A.581
B.582
C.583
D.584
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
The advantage of geostationary satellites is（）.
SOLAS ships shall be equipped with（）.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
The priority of EGC messages is classified by（）.
Please use（）for（）.