How does a coast radio station communicating by HF radio normally identify itself?（）<br>A:By its subscriber number<br>B:By its call sign<br>C:By its MMSI<br>D:By its MID

How does a coast radio station communicating by HF radio normally identify itself?（）
A:By its subscriber number
B:By its call sign
C:By its MMSI
D:By its MID

出自：海船船员证

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