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
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Geostationary satellite are artificial satellite which（）.
A.always move slowly
B.are in one place only
C.sometimes move and sometime don‟t
D.synchronize with the movement of the earth -
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A radio link between a transmitting earth station and a receiving earth station through one satellite is named a（）.
A.Radio link
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International Navtex service is（）.
A.a terrestrial MF system
B.a satellite communication system
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