如图甲所示在同一竖直平面内的两正对着的相同的半圆光�轨道相隔一定的距离x虚线沿竖直方�.一小球能在其间运动今在最高点与最低点各放 个 Template




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tomski如图甲所示在同一竖直平面内的两正对着的相同的半圆光�轨道相隔一定的距离x虚线沿竖直方�.一小球能在其间运动今在最高点与最低点各放 个 coloring