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

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

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

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

For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.

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

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

At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

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.

The priority of EGC messages is classified by（）.