问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B