A.anywhere in the world
B.at sea
C.in the air
D.ashore
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A.1982
B.1980
C.1984
D.1988
A.alerting
B.on-scene communication
C.safety information
D.general communication
A.sometimes
B.all times
C.never
D.partly
A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power
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
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As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
The priority of EGC messages is classified by（）.
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.
Before GMDSS, if the radio officer on board is serious ill,（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
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.
Please use（）for（）.
All coast radio stations（）DSC installed for VHF and HF.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.