A.to avoid mutual interference
B.to keep silence
C.owing to the time-share nature
D.to regulate transmitter power
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A.from any INMARSAT satellite
B.via any appropriate Navtex and EGC station
C.via the satellite the MES is tracking
D.from any RCC and coast station
A.four
B.six
C.five
D.three
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
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
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
We consider（）send a helicopter with medical facilities to the distress area.
（）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.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Ship-to-ship distress alerting should be conducted by（）.
The rescue coordination center may（）on stations which interfere with traffic.
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.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.