For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.

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.

By using（）system a ship can send a distress message and know with certainty it will be received.

The advantage of geostationary satellites is（）.

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

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

Ship-to-ship distress alerting should be conducted by（）.

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.