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

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.

Radio beacon can be activated（）in case of distress.

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.

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

The frequency（）the safety message will be transmitted shall be included in DSC safety call.

The advantage of geostationary satellites is（）.

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

Please use（）for（）.

The priority of EGC messages is classified by（）.