A.enter the system / contact an RCC
B.access to INMARSAT / establish contact with a CES
C.have absolute priority to enter the system / make contact with a CES
D.enter the system gradually / wait for rescue
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A.easy and expensive
B.simple and certain
C.dangerous and stable
D.difficult and compulsory
A.1980
B.1981
C.1979
D.1982
A.assist
B.send a rescue vessel
C.search the distress area
D.reach the distress position at once
A.alternation
B.alternate
C.alter
D.alternative
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
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（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
Before GMDSS, if the radio officer on board is serious ill,（）.
All coast radio stations（）DSC installed for VHF and HF.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
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.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The advantage of geostationary satellites is（）.
Ship-to-ship distress alerting should be conducted by（）.
We consider（）send a helicopter with medical facilities to the distress area.
On-scene communications will normally take place between（）.