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多普勒效应动态演示
Author:
孟宝兴
GeoGebra
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兩組對邊相等的四邊形
四邉形 (四年級) 教師版
sanjiaohanshu
近似值：有效數字
算柱 (兩位數)
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給錐體一個名字 1
中華民國國旗
等角对等边
函数作图工具的副本
等轴双曲线
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Diagrams
Pyramid
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Geometry
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