A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours
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A.on the bridge
B.in the coast station
C.on the forecastle
D.on starboard side
A.search and rescue
B.safe
C.co-ordinated
D.hydrographic
A.special
B.different
C.expensive
D.valuable
A.a mother ship
B.a lifeboat
C.a life craft
D.all of A,B,C
A.any transmission
B.any harmful transmission
C.to use radiotelephone
D.using radiotelephone
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We consider（）send a helicopter with medical facilities to the distress area.
Before GMDSS, if the radio officer on board is serious ill,（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The rescue coordination center may（）on stations which interfere with traffic.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
SOLAS ships shall be equipped with（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
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.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.