如图所示两个半径不同内壁光�的半圆轨道固定于地面一小球先后从与球心在同一水平高度上的ab两点从静止开始自由�下通过最低点时下述 Template




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tomski如图所示两个半径不同内壁光�的半圆轨道固定于地面一小球先后从与球心在同一水平高度上的ab两点从静止开始自由�下通过最低点时下述 coloring