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.

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.

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.

Ship-to-ship distress alerting should be conducted by（）.

By using（）system a ship can send a distress message and know with certainty it will be received.

SOLAS ships shall be equipped with（）.

The priority of EGC messages is classified by（）.