The priority of EGC messages is classified by（）.

COSPAS-SARSAT is intended to be used for（）.

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

The rescue coordination center may（）on stations which interfere with traffic.

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.

The advantage of geostationary satellites is（）.

（）will form the basis for distress alerting and safety calling.

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

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

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