单项选择题
The Network Coordination station for the INMARSAT-A coast stations in the Pacific ocean region is in（）.
A.Yamaguchi, Japan B.Beijing, China C.Nakhodka, Russia D.Perth, Australia
单项选择题 The NCS of INMARSAT-A system in the IOR is in（）.
单项选择题 The GMDSS defines four sea area based on the（）.
单项选择题 The position if the IOR satellite in the INMARSAT system is（）above the equator.
