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

（）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.

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.

All coast radio stations（）DSC installed for VHF and HF.

SOLAS ships shall be equipped with（）.

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

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

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.

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

The vessel has stayed in port for seven days because she needs（）.