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

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

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

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

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

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

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.

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.

SOLAS ships shall be equipped with（）.

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