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单选题 (三角函数基础051)如图所示,某建筑物楼顶有信号塔EF,卓玛同学为了探究信号塔
的高度,从建筑物一层A点沿直线AD出发,到达C点时刚好能看到信号塔的最高点F,测得仰角∠ACF=60°,AC长7米.接着卓玛再从C点出发,继续沿AD方向走了8米后到达B点,此时刚好能看到信号塔的最低点E,测得仰角∠B=30°.(不计卓玛同学的身高)则信号塔EF的高度为( ).
B. 4
m
C. 2m
学科：高等数学
时间：2023-10-15 12:13:20
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题目7单选题
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题目10单选题
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