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2009年北京国庆阅兵式上举行升旗仪式,在坡度为15°的观礼台上,某一列座位与旗...
2009年北京国庆阅兵式上举行升旗仪式,在坡度为15°的观礼台上,某一列座位与旗杆在同一个垂直于地面的平面上,在该列的第一排和最后一排测得旗杆顶端的仰角分别为60°和30°,且第一排和最后一排的距离为
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米,则旗杆的高度为
米.
考点分析:
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=
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△ABC中,AB边的高为CD,若
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=
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•
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=0,|
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|=1,|
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|=2,则
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=( )
A.
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B.
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D.
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