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

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.

（）will form the basis for distress alerting and safety calling.

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）

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

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

Please use（）for（）.

Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.

The priority of EGC messages is classified by（）.

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.