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动量守恒1--小球四分之一圆弧模型
Author:
高长乐
GeoGebra
New Resources
錐體建築師
兩位數加法
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
球体的体积推导（优化版）
Discover Resources
chap. 1 by ck
http://www.qsir.org/?p=8853
六年級_截面_錐體_多邊形
S0S1 柱體與椎體
表内除法
Discover Topics
Scatter Plot
Continuity
Ellipse
Solids or 3D Shapes
Linear Functions