Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

Radio communication（）for many years and helps to save tens of thousands of lives.

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

All coast radio stations（）DSC installed for VHF and HF.

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.

Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.

Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）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（）.

The advantage of geostationary satellites is（）.