单项选择题
In general, there are two parts in an SES, One of these is antenna eqipment also referred to as（）.
A.BDE B.UDE C.AEP D.ADE
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（）.
单项选择题 Any ship with SES can（）and（）through the Inmarsat satellites when sending a distress alert.
