A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power
您可能感興趣的試卷
你可能感興趣的試題
A.from any INMARSAT satellite
B.via any appropriate Navtex and EGC station
C.via the satellite the MES is tracking
D.from any RCC and coast station
A.four
B.six
C.five
D.three
A.selective and can be suppressed by ships
B.mandatory and can not be suppressed by ships in the affected area
C.not very important so that ships don‟t require them
D.received by all ships wherever they are
A.all vessels
B.selected groups of ships
C.a particular ship
D.A, B, C are all right
A.a coast station/a ship station
B.an EPIRB/a SART
C.ARQ/FEC
D.a back-up satellite/a land SAR unit
最新試題
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.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
The advantage of geostationary satellites is（）.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Radio communication（）for many years and helps to save tens of thousands of lives.
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.
SOLAS ships shall be equipped with（）.
Radio beacon can be activated（）in case of distress.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.