9.如图所示固定在地面上截面圆心为o半径为r表面粗糙的半圆柱体其上方固定一个光�曲线轨道abab间的竖直高度为r轨道底端水平并与 Template




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tomski9.如图所示固定在地面上截面圆心为o半径为r表面粗糙的半圆柱体其上方固定一个光�曲线轨道abab间的竖直高度为r轨道底端水平并与 coloring