A.the range of antenna can cover everywhere in the world
B.we can know the ship’s exact position
C.that the distress alert can be located as soon as possible
D.antenna of permanent earth stations may be directed towards fixed points in the sky
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最新試題
The priority of EGC messages is classified by（）.
All coast radio stations（）DSC installed for VHF and HF.
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.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
On-scene communications will normally take place between（）.
（）will form the basis for distress alerting and safety calling.
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.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Radio communication（）for many years and helps to save tens of thousands of lives.