2012年首届中国国际航空体育节在莱芜雪野举办,期间在市政府广场进行了热气球飞行表演.如图,有一热气球到达离地面高度为36米的 A 处时,仪器显示正前方一高楼顶部 B 的仰角是37°,底部 C 的俯角是60°.为了安全飞越高楼,气球应至少再上升多少米?(结果精确到0.1米) (参考数据: )
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