如图a所示水平放置的平行�属板a和b间的距离为d极长l=2$sqrt{3}$db板的右侧边缘恰好是倾斜挡板nm上的一个小孔knm Template




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tomski如图a所示水平放置的平行�属板a和b间的距离为d极长l=2$sqrt{3}$db板的右侧边缘恰好是倾斜挡板nm上的一个小孔knm coloring