A.NBDP/VHF radio
B.Inmarsat safetyNet/NAVTEX
C.Safety service / Inmarsat-A
D.Long range / short range
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A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP
A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise to sunset
A.transmit distress signal
B.send response signal
C.transmit the signal of ship‟s position
D.be interrogated by X-band radar
A.sight or sound
B.seeing or sounding
C.visual or audible
D.seeing or hearing
A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations
最新試題
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
Radio beacon can be activated（）in case of distress.
（）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.
SOLAS ships shall be equipped with（）.
On-scene communications will normally take place between（）.
What following is not among the function of SOLAS ships?（）
The priority of EGC messages is classified by（）.
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.
COSPAS-SARSAT is intended to be used for（）.