选择题:阿基米德多面体(Archimedean polyhedra)是由两种或三种正多边形面组成的半正多面体.它共有13种,其特点是棱长相等.如图1,顺次连接棱长为2的

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阿基米德多面体(Archimedean polyhedra)是由两种或三种正多边形面组成的半正多面体.它共有13种,其特点是棱长相等.如图1,顺次连接棱长为2的正方体各棱的中点,得到一个阿基米德多面体,如图2,在此阿基米德多面体的所有棱中任取两条,则两条棱垂直的概率为_

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