A.cannot
B.are not allowed
C.have the right
D.should get permission to
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A.every two years
B.every three years
C.every year
D.every four years
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
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As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
The advantage of geostationary satellites is（）.
Before GMDSS, if the radio officer on board is serious ill,（）.
Please use（）for（）.
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.
COSPAS-SARSAT is intended to be used for（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Radio communication（）for many years and helps to save tens of thousands of lives.
By using（）system a ship can send a distress message and know with certainty it will be received.