8.如图所示上表面光�的半圆柱体放在水平面上小物块从靠�半圆柱体顶点o的a点 在外力f作用下沿圆弧缓慢下�到b点此过程中f始终沿圆弧的 Template




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tomski8.如图所示上表面光�的半圆柱体放在水平面上小物块从靠�半圆柱体顶点o的a点 在外力f作用下沿圆弧缓慢下�到b点此过程中f始终沿圆弧的 coloring