如图所示半圆形半�凹槽放在光�的水平面上小�块从凹槽边缘a点由静止释放经最低点b又�上到达另一侧边缘c.把从a点到达b点称为过程i从b Template




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tomski如图所示半圆形半�凹槽放在光�的水平面上小�块从凹槽边缘a点由静止释放经最低点b又�上到达另一侧边缘c.把从a点到达b点称为过程i从b coloring