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

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

SOLAS ships shall be equipped with（）.

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

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

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.

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

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.

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.

What following is not among the function of SOLAS ships?（）