A.switch operator
B.communication gateway
C.national operator
D.on-scene commande
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A.64.5E
B.178E
C.15.5W
D.54W
A.always move slowly
B.are in one place only
C.sometimes move and sometime don‟t
D.synchronize with the movement of the earth
A.Radio link
B.Space segment
C.Satellite link
D.upper link
A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system
A.Russian
B.French
C.English
D.German
最新試題
The advantage of geostationary satellites is（）.
SOLAS ships shall be equipped with（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
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.
The priority of EGC messages is classified by（）.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
What following is not among the function of SOLAS ships?（）