As each MSI message will have a unique identity, the printing of messages already received correctly is（）.

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

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

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

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

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

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.

Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.

The priority of EGC messages is classified by（）.

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