A.they all have different limitations with respect to coverage
B.they all have different limitations in the technology they use
C.different systems apply to different ships
D.all of above
您可能感興趣的試卷
你可能感興趣的試題
A.ship-to-shore
B.shore-to-ship
C.bridge-to-bridge
A.some
B.lots of
C.many
D.all
A.impossible
B.possible
C.easy
D.difficult
A.55.5 W
B.180E
C.15.5W
D.64.5E
A.one means, whether satellite or terrestrial techniques
B.two means, whether satellite or terrestrial techniques
C.two separate and independent means, each using different radio communication services
D.two means, such as MF DSC and HF DSC
最新試題
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.
Please use（）for（）.
（）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.
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.
（）will form the basis for distress alerting and safety calling.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
Radio communication（）for many years and helps to save tens of thousands of lives.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
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.