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

（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.

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.

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.

（）will form the basis for distress alerting and safety calling.

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.

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

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

The rescue coordination center may（）on stations which interfere with traffic.

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