9.如图所示两个半径不同而内壁光�的半圆轨道固定于地面一个小球先后从与球心在同一水平高度的ab两点由静止开始自由下�通过轨道最低点时 Template




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tomski9.如图所示两个半径不同而内壁光�的半圆轨道固定于地面一个小球先后从与球心在同一水平高度的ab两点由静止开始自由下�通过轨道最低点时 coloring