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Angle Between a Line and a Plane Definition 線與平面的交角 定義
Author:
Steven S. H. Chu
GeoGebra
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【案例】2013年安徽高考15题
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
兩組對邊相等的四邊形
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