17.
如图,热气球的探测器显示,从热气球A处看一栋楼顶部B处的仰角为30°,看这栋楼底部C处的俯角为60°,热气球A处与楼的水平距离为120m,则这栋楼的高度为( )
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| A. | 160$\sqrt{3}$m | B. | 120$\sqrt{3}$m | C. | 300m | D. | 160$\sqrt{2}$m |