When you have received GA+ from the CES for the INMARSAT-A telex communication, you should immediately select（）and（）you required.<br>A:an CES / telex mode<br>B:an SES telex service<br>C:the service /the subscriber<br>D:a satellite /an ocean region

When you have received GA+ from the CES for the INMARSAT-A telex communication, you should immediately select（）and（）you required.
A:an CES / telex mode
B:an SES telex service
C:the service /the subscriber
D:a satellite /an ocean region

出自：海船船员证

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