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
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相关考题
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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 -
单项选择题
When the power of SART is on, it will（）.
A.transmit distress signal
B.send response signal
C.transmit the signal of ship‟s position
D.be start by X-band radar
