海上有A、B两个小岛相距10 nmile,从A岛望B岛和C岛成60°的视角,从B岛望A岛和C岛成75°角的视角,则B、C间的距离是 ( )
A.5nmile B.10
nmile C.
nmile D.5
nmile
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海上有A、B两个小岛相距10 nmile,从A岛望B岛和C岛成60°的视角,从B岛望A岛和C岛成75°角的视角,则B、C间的距离是 ( )
A.5nmile B.10
nmile C.
nmile D.5
nmile