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

Please use（）for（）.

The priority of EGC messages is classified by（）.

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.

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

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

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.

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

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

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