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任意两电荷电场线、等势面分布（平面）
Author:
吴志敏
GeoGebra
New Resources
兩組對邊相等的四邊形
近似值：有效數字
找出對稱軸
拼砌四邊形
小数 的副本
Discover Resources
圓的展開partI
S3 Law of Indices
內輪差...
斜率的副本
圖解兩向量所張開之平行四邊形面積
Discover Topics
Symmetry
Functions
Rotation
Logarithm
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