A.from any Inmarsat satellite
B.from any appropriate Navtex and EGC station
C.via the satellite the SES is tracking
D.from any RCC and coast station
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A.identify
B.Correct
C.Reject
D.Print out
A.B2
B.B1
C.MAR
D.NNN
A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time
A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours
A.in any INMARSAT regions
B.in each NAVTEX area
C.at any distance
D.in Areas A3 and A4
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Please use（）for（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The rescue coordination center may（）on stations which interfere with traffic.
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.
Before GMDSS, if the radio officer on board is serious ill,（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
The advantage of geostationary satellites is（）.