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.
A.an CES / telex mode B.an SES telex service C.the service /the subscriber D.a satellite /an ocean region
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（）.
单项选择题 In general, there are two parts in an SES, One of these is antenna eqipment also referred to as（）.
