A.alternation
B.alternate
C.alter
D.alternative
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A.all ships in a large sea area
B.only the sea authorities ashore
C.the SAR units ashore and at sea
D.the port radios and the coast stations
A.some
B.lots of
C.many
D.all
A.impossible
B.possible
C.easy
D.difficult
A.climate
B.sunshine
C.human beings
D.both a and b
A.One means, whether satellite or terrestrial techniques
B.Two means, whether satellite or terrestrial techniques
C.Two separate and independent means, each using different radio communication services
D.Two means, such as MF DSC and HF DSC
最新試題
Before GMDSS, if the radio officer on board is serious ill,（）.
We consider（）send a helicopter with medical facilities to the distress area.
Radio beacon can be activated（）in case of distress.
All coast radio stations（）DSC installed for VHF and HF.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
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.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
The rescue coordination center may（）on stations which interfere with traffic.
On-scene communications will normally take place between（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.