【单选题】
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
查看正确答案
A、How ofen do the course？ B、How about the flavour of this course？ C、How long does it preparefor dinner？ D、How long does it take to cook this course？
