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單項選擇題

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

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單項選擇題

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

單項選擇題

What language does International NAVTEX use?（）

A.Russian
B.French
C.English
D.German