A.selective and can be suppressed by ships
B.mandatory and can not be suppressed by ships in the affected area
C.not very important so that ships don‟t require them
D.received by all ships wherever they are
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A.all vessels
B.selected groups of ships
C.a particular ship
D.A, B, C are all right
A.a coast station/a ship station
B.an EPIRB/a SART
C.ARQ/FEC
D.a back-up satellite/a land SAR unit
最新試題
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
Please use（）for（）.
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.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.