单项选择题
A.it necessary B.it is necessary C.it necessary to D.necessary
Radiotelephony communication or radio telex communicati...
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.
A.depend on B.depending on C.dependent on D.depended on
Distress traffic is the communication（）between the stat...
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.
A.exchange B.to exchange C.exchanging D.exchanged
Monitoring is especially important in a highly automate...
单项选择题Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
A.adherence to B.adoption to C.relaying on D.usage of
