The identification character of each Navtex station is regarded as（）to the messages.<br>A:the only preamble<br>B:a part of the preamble<br>C:the closing<br>D:the suspension

The identification character of each Navtex station is regarded as（）to the messages.
A:the only preamble
B:a part of the preamble
C:the closing
D:the suspension

出自：海船船员证

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