单项选择题
A.Radio link B.Space segment C.Satellite link D.upper link
International Navtex service is（）.A.a terrestrial MF sy...
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
What language does International NAVTEX use?（）A.Russian...
单项选择题What language does International NAVTEX use?（）
A.Russian B.French C.English D.German
When the power of SART is on, it will（）.A.transmit dist...
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
