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Angle of elevation and Angle of depression(仰角和俯角)
Author:
chisunch1
GeoGebra
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【案例】2018年全国1卷理科12题
找出對稱軸
直角坐標平面上的旋轉變換
判斷球體
三位數除以一位數（一）
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Real Numbers
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