单项选择题
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
单项选择题 In general, there are two parts in an SES, One of these is antenna eqipment also referred to as（）.
单项选择题 After successful commissioning , the（）will permit the SES access to system.
单项选择题 A mobile earth station in the maritime mobile-satellite service,which is located on board ship,is called（）.