在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴与桌面垂直过轴线的截面为等边三角形如图所示.有一半径为r的圆柱形平行光束垂直入射 Template




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tomski在桌面上有一倒立的玻璃圆锥其顶点恰好与桌面接触圆锥的轴与桌面垂直过轴线的截面为等边三角形如图所示.有一半径为r的圆柱形平行光束垂直入射 coloring