单项选择题
The position of the AOR-W satellite in the INMARSAT system is（）above the equator.
A.64.5E B.178E C.15.5W D.54W
单项选择题 Geostationary satellite are artificial satellite which（）.
单项选择题 A radio link between a transmitting earth station and a receiving earth station through one satellite is named a（）.
单项选择题 International Navtex service is（）.
