A.HF
B.VHF
C.MF
D.MF/HF
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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
A.only automatically
B.only manually
C.both automatically and manually
D.only by remote control
A.be damaged
B.work normally regardless of harmful conditions
C.not wok though it is not in a bad condition
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（）will form the basis for distress alerting and safety calling.
All coast radio stations（）DSC installed for VHF and HF.
The advantage of geostationary satellites is（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
SOLAS ships shall be equipped with（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
Radio communication（）for many years and helps to save tens of thousands of lives.
Radio beacon can be activated（）in case of distress.