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To establish a communication channel for the telex service in the INMARSAT-Aterminal, you should first（）.
A:establish a communication channel from the CES, via the International Telex Network to the final destination
B:set up a communication channel from your SES, via a satellite, to a CES within your ocean region
C:set up a channel directly to the addressee at the destination
D:establish a channel from your terminal , via the International Telex Network to a CES within your ocean region

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出自：海船船员证

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