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.

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

The priority of EGC messages is classified by（）.

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

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

（）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.

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

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

On-scene communications will normally take place between（）.

Please use（）for（）.