A.200
B.300
C.400
D.800
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A.a dummy antenna
B.a supporting facilities
C.a back-up equipment
D.an antenna
A.HF
B.VHF
C.MF
D.MF/HF
A.518
B.2182
C.156.8
D.2187.5
A.1 February 1995
B.1 February 1992
C.1 July 1997
D.1 February 1999
A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C
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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.
COSPAS-SARSAT is intended to be used for（）.
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.
Please use（）for（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
SOLAS ships shall be equipped with（）.
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.
The priority of EGC messages is classified by（）.