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如图,一船在海上由西向东航行,在A处测得某岛M的方位角为北偏东α角,前进m(km...
如图,一船在海上由西向东航行,在A处测得某岛M的方位角为北偏东α角,前进m(km)后在B处测得该岛的方位角为北偏东β角,已知该岛周围n(km)范围内(包括边界)有暗礁,现该船继续东行,当α与β满足条件
时,该船没有触礁危险.
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D.
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