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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
垂直線的斜率
撒针估算面积实验
科氏力 (Coriolis Force)
比較五件物件的重量
讀磅
Discover Resources
畢氏定理
task3
徐州2015中考-28
小圓內繞大圓
test
Discover Topics
Natural Numbers
Functions
Means
Arithmetic
Expected Value