In the International Code of signals，a group of three letters indicates（）.<br>A:urgency or an emergency<br>B:the vessel's national identity signal<br>C:a group from the general signal code<br>D:a group from the medical signal code

In the International Code of signals，a group of three letters indicates（）.
A:urgency or an emergency
B:the vessel's national identity signal
C:a group from the general signal code
D:a group from the medical signal code

出自：海船船员证

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