单项选择题 When you have received GA+ from the CES for the INMARSAT-A telex communication, you should immediately select（）and（）you required.

单项选择题 The maritime access code for the AOR-E is（）in INMARSAT-A Telex Service.

单项选择题 To establish a communication channel for the telex service in the INMARSAT-Aterminal, you should first（）.