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俄罗斯方块（第二版）
Author:
孟宝兴
GeoGebra
New Resources
兩組對邊相等的四邊形
算柱 (兩位數)
【案例】2013年安徽高考15题
四邊形的特性
【案例】圆柱体内放置一个大球六个小球
Discover Resources
White Kaneki GGB
函數
垂線性質2
Angle between line and plane
雙曲線的幾何性質
Discover Topics
Pyramid
Set Theory
Reflection
Definite Integral
Piecewise Functions