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.

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

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

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

The advantage of geostationary satellites is（）.

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

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

If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.

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

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