The principal advantage of NAVTEX radio warnings is that（）.<br>A:they can be used by mariners who do not know Morse code<br>B:only an ordinary FM radio is necessary to receive these warnings<br>C:information on a given topic is only broadcast at specified times<br>D:they cover a broad spectrum of the radio band allowing reception on almost any type of receiver

The principal advantage of NAVTEX radio warnings is that（）.
A:they can be used by mariners who do not know Morse code
B:only an ordinary FM radio is necessary to receive these warnings
C:information on a given topic is only broadcast at specified times
D:they cover a broad spectrum of the radio band allowing reception on almost any type of receiver

出自：海船船员证

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