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凹凸透镜对平行光线的作用
Author:
李大地(Field Lee)
GeoGebra
New Resources
【案例】2013年安徽高考15题
空间中两直线的位置关系
讀磅
祖冲之的期望：内棋与外棋
漂亮的摇摆曲线
Discover Resources
angle0428
PMC 2014-15 Q4
太陽系的認識(問答)
試算表的應用
黄金螺线与向日葵-朱老师
Discover Topics
Similar Triangles
Line Segment
Ratios
Intersection
Fractal Geometry