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.<br>A:exchange<br>B:to exchange<br>C:exchanging<br>D:exchanged

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

出自：海船船员证

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