prisms

By reducing the tangential representation set of small covers over prisms to a prime form,this article determines the classification of small covers over prisms up to equivariant cobordism.

文通过将棱柱上的小覆盖的切表示集约化到一种素形式,确定其等变配边分类。

Using phasemeter, the two prisms can be moved out off the beam, so the system can be used to measure coaxality.

对测量信号的处理，采用比相技，测量元件可以暂时移出光路，因而能够进行同轴度的测量。

When the lens is in focus, the rays coincide at the plane of the focusing screen, and objects see through the prisms appear "unsplit.

如果镜头聚焦了，光线在聚焦屏平面上重合，物体就看起“有裂开”。