A.NAVTEX
B.EGC
C.HF-telex
D.all of above
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A.can be overcome by using traditional techniques
B.cannot be overcome by satellite system
C.can be overcome by satellite and digital techniques
D.cannot be tackled by any modern system
A.business opportunity
B.good-quality radio telephone conversations
C.telex service
D.both B and C
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As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
On-scene communications will normally take place between（）.
All coast radio stations（）DSC installed for VHF and HF.
Before GMDSS, if the radio officer on board is serious ill,（）.
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.