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Author:
johnmayhk
GeoGebra
New Resources
柱體建築師
三位數除以一位數（一）
直角坐標平面上的旋轉變換
算柱 (兩位數)
錐體建築師
Discover Resources
Bearings 方位
过圆上一点作切线，三步
Travelling Waves
正立方體->菱形十二面體(滑桿動畫)
多普勒效应动态演示
Discover Topics
Line Segment
Diagrams
Parallelogram
Median Value
Confidence Interval