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心電感應
Author:
李春培
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中考2018沈阳
y=a(x-h)²+k的副本
Wheel on curve
比較角的大小(直接比較)
探究正方體的截面
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ghseh 二次函數描點法頂點法-3
标题了
時針與分針的夾角
數學2
径向力守恒定律（几何作图）
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Correlation
Exponential Functions
Natural Numbers
Derivative
Normal Distribution
