单项选择题 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.

单项选择题 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.

单项选择题 Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.