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三角函数线
Author:
林峰
GeoGebra
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球体的体积推导（优化版）
【案例】2018年全国1卷理科12题
四邊形的特性
錐體建築師
四邉形 (四年級) 教師版
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自行车运动
winter vacation homework 6
優良作品2(怡婷)
Similar triangles reasons
tool1
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Vectors
Isosceles Triangles
Plane Figures or Shapes
Trigonometry
Set Theory