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

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

The advantage of geostationary satellites is（）.

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

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.

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.

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

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