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一道三视图的题目（三视图作法参考）
Author:
肖建伟
GeoGebra
New Resources
Earth with coastline
美國國旗 (Codex 版)
近似值：有效數字
判斷球體
兩組對邊相等和有直角的四邊形
Discover Resources
緯度、日照、影長
包絡線
Slope
異分母分數除法
勒洛三角形頂點A軌跡
Discover Topics
Pie Chart or Circle Chart
Matrices
Right Triangles
Exponential Functions
Definite Integral