vip彩票
<tr id='zmJgdj'><strong id='zmJgdj'></strong><small id='zmJgdj'></small><button id='zmJgdj'></button><li id='zmJgdj'><noscript id='zmJgdj'><big id='zmJgdj'></big><dt id='zmJgdj'></dt></noscript></li></tr><ol id='zmJgdj'><option id='zmJgdj'><table id='zmJgdj'><blockquote id='zmJgdj'><tbody id='zmJgdj'></tbody></blockquote></table></option></ol><u id='zmJgdj'></u><kbd id='zmJgdj'><kbd id='zmJgdj'></kbd></kbd>
说 明 利用两面相对的镜子，使光线在它们之间来回反射，然观看者看到一个无限重复的影像，展示了平面↑镜和半透半反镜的几何光学特性。 尺寸：0.85×0.85×0.1m
