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12-6-2-多普勒效应2-波源静止，观察者运动-尤景汉
Author:
王翚
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
平行線的斜率
圓的切線方程
【案例】2018年全国1卷理科12题
球体的体积推导（优化版）
Discover Resources
軌跡
畢氏定理動態證明(歐基里得，應用時間參數跳躍函數)
正弦函數y=sin(x)的泰勒級數
Congruent Triangle (SSS)
切线
Discover Topics
Function Graph
Sequences and Series
Upper and Lower Sum or Riemann Sum
Equilateral Triangles
General Quadrilateral