单项选择题
A.Q-code B.Telephone numbers and addresses C.the international Codes of Signals D.radio instructions
Digital Selective Calling means a technique using（）whic...
单项选择题Digital Selective Calling means a technique using（）which which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.
A.digital codes B.code messages C.norse codes D.distress messages
（）means a technique using digital codes which enables a...
单项选择题（）means a technique using digital codes which enables a radio station to establish contact with, and transfer information to another station or group of stations and complying with the relevant recommendations of the CCIR.
A.DSC B.MSI C.EGC D.NBDP
（）means navigational and meteorological warnings, meteo...
单项选择题（）means navigational and meteorological warnings, meteorological forecasts and other urgent related messages broadcast to ships.
A.Navigational broadcast B.weather forecast C.Urgency message D.Maritime Safety Information
