单谱线多元件透镜可以有不同的外形和材料，有玻璃的，二氧化硅的，蓝宝石的和钙氟化合物的。
Singlet and multielement lenses are available in a wide variety of configurations and materials, including glass, fused silica, sapphire, and calcium fluoride.
本文提出了借助于电子计算机，用列车编组单对影响线加载来模拟铁路桥梁疲劳应力谱的方法。
With the aid of a computer, a method used to simulate the fatigue stress spectra of railway Bridges by loading the influence lines with the train marshalling list is presented in this paper.
该方法复杂度低，并可弥补常规方法仅采用单条最大能量谱线进行参数估计的不足。
The scheme has low complexity and can overcome the shortcomings of common methods which adopt only the single spectra line having maximum energy to estimate single tone jamming parameters.
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