单项选择题
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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相关考题
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单项选择题
A radio link between a transmitting earth station and a receiving earth station through one satellite is named a（）.
A.Radio link
B.Space segment
C.Satellite link
D.upper link -
单项选择题
International Navtex service is（）.
A.a terrestrial MF system
B.a satellite communication system
C.a land HF radio system
D.a coastal VHF system -
单项选择题
What language does International NAVTEX use?（）
A.Russian
B.French
C.English
D.German
