单项选择题
A.WMO B.IHO C.IMO D.WARC
Geostationary satellites are the artificial satellites ...
单项选择题Geostationary satellites are the artificial satellites which（）.
A.always move slowly B.are in one place only C.sometime move sometime don‟t move D.are synchronizing with the movement of the earth
What following is not among the functions of SOLAS ship...
单项选择题What following is not among the functions of SOLAS ships?（）
A.receive shore-to-ship distress alerting B.transmit ship-to-shore distress alerting C.receive message for public correspondence D.transmit and receive locating signals
The existing terrestrial radio system has a number of b...
单项选择题The existing terrestrial radio system has a number of basic flaws which（）.
A.can be overcome by using traditional techniques B.can not be overcome by satellite system C.can be overcome by satellite and digital techniques D.can not be tackled by any modern system
