A、300
B、400
C、500
D、600
更多“NAVTEX transmissions have a designed range of about（）nautical miles.”相关的问题
A、be transmitted at once though the frequency is not clear B、be transmitted as soon as the frequency is cleared coordinately C、be transmitted at its scheduled transmissions D、be transmitted at next scheduled transmissions
A、frequency allocated B、both language and frequency C、language used D、transmission power and time
A、frequency allocated B、both language and frequency C、language used D、transmission power and time
A、urgent traffic B、distress alert C、routine traffic D、NAVTEX message
A、urgent traffic B、distress alert C、routine traffic D、NAVTEX message
A、10 minutes every 4 hours B、half an hour every other hour C、irregular period of time D、5 minutes every two hours
A、10 minutes every 4 hours B、half an hour every other hour C、irregular period of time D、5 minutes every two hours
A、把每一个NAVTEX区域的所有电台分成四组，每个电台工作4小时，最长允许工作10min B、把每一个NAVTEX区域的所有电台分成六组，每个电台工作4小时，最长允许工作10min C、把每一个NAVTEX区域的所有电台分成四组，每个电台工作4小时，最长允许工作15min D、把每一个NAVTEX区域的所有电台分成六组，每个电台工作4小时，最长允许工作15min
A、the information can be received on an ordinary FM radio B、warnings are printed out for reading when convenient C、broadcasts are at scheduled times D、a low frequency band is used for long distance transmission
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