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.

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.

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

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.

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

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

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

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

（）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.