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

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

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

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

The priority of EGC messages is classified by（）.

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

Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

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

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

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