单项选择题
A mobile earth station in the maritime mobile-satellite service,which is located on board ship,is called（）.
A.an LES B.an SES C.a ship station D.a Land Mobile Station
单项选择题 Any ship with SES can（）and（）through the Inmarsat satellites when sending a distress alert.
单项选择题 The Network Coordination station for the INMARSAT-A coast stations in the Pacific ocean region is in（）.
单项选择题 The NCS of INMARSAT-A system in the IOR is in（）.
