单项选择题
We consider（）send a helicopter with medical facilities to the distress area.
A.it necessary
B.it is necessary
C.it necessary to
D.necessary
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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 -
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
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A.adherence to
B.adoption to
C.relaying on
D.usage of
