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钟表制作成功啦
Author:
辛贺华
GeoGebra
New Resources
判斷球體
兩組對邊相等的四邊形
四邊形的特性
拼砌四邊形
球体的体积推导（优化版）
Discover Resources
函数的单调性和导数
smps perimeter
外资知名
equations of circle 1
水流問題(黑板)
Discover Topics
Conic Sections
Quadrilaterals
Geometric Transformations
Trapezium
Pythagoras or Pythagorean Theorem