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.

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

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

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

The priority of EGC messages is classified by（）.

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

The advantage of geostationary satellites is（）.

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

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.

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