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

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

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

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

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.

Before GMDSS, if the radio officer on board is serious ill,（）.

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

On-scene communications will normally take place between（）.

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

The vessel has stayed in port for seven days because she needs（）.