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
On-scene communications will normally take place between（）.
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.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
The priority of EGC messages is classified by（）.
The rescue coordination center may（）on stations which interfere with traffic.
Before GMDSS, if the radio officer on board is serious ill,（）.
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.
The vessel has stayed in port for seven days because she needs（）.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.