如图所示两个半径不同而内壁光�的半圆轨道固定在地面上质量相等的两个小球分别从与球心在同一水平高度的ab两点由静止开始自由�下它们通过 Template




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tomski如图所示两个半径不同而内壁光�的半圆轨道固定在地面上质量相等的两个小球分别从与球心在同一水平高度的ab两点由静止开始自由�下它们通过 coloring