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直线与平面垂直的折纸实验
Author:
孟宝兴
GeoGebra
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【案例】2018年全国1卷理科12题
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
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test P1
cherry family
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