Please use（）for（）.

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

Radio communication（）for many years and helps to save tens of thousands of lives.

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

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

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

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

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

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

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