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

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

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

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.

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

SOLAS ships shall be equipped with（）.

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

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

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

Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.