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光的折射
Author:
学用数学
GeoGebra
New Resources
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
兩位數加法
拼砌四邊形
球體建築師
Discover Resources
百分數（小學）：折扣 / 賺賠（HTML5 版）
水波干涉
盾牌
弓形的滚动
congruent triangle_provided by Mr Yeung Kar Chun
Discover Topics
Planes
Sphere
Similarity Transformation or Similarity
Sine
Bar Chart or Bar Graph