We consider（）send a helicopter with medical facilities to the distress area.

The vessel has stayed in port for seven days because she needs（）.

Please use（）for（）.

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）

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.

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

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.

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

If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.