A.in any INMARSAT regions
B.in each NAVTEX area
C.at any distance
D.in Areas A3 and A4
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A.navigational / typhoon
B.traffic / meteorological
C.marine / hurricane
D.navigational / meteorological
A.dedicated system
B.MSI broadcasts
C.518KHZ
D.channel 16
A.ship’s movement
B.safety
C.ship’s management
D.hazards
A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise and sunset
A.DF
B.Radar System
C.DSC System
D.COSPAS-SARSAT
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The advantage of geostationary satellites is（）.
Ship-to-ship distress alerting should be conducted by（）.
The vessel has stayed in port for seven days because she needs（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
COSPAS-SARSAT is intended to be used for（）.
All coast radio stations（）DSC installed for VHF and HF.
SOLAS ships shall be equipped with（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.