Advantageously, the structure further comprises a gradient refractive index layer.
有利的是，该结构进一步包括梯度折射系数层。
This system includes 46 indexes in 4 layers: goal layer, criterion layer, field layer, and index layer.
该指标体系设立目标层、准则层、领域层和指标层4个层次的指标，共有46个指标。
The Index layer is formed by a number of indicators, divided into qualitative and quantitative.
指标层由准则层下的各项指标因子组成，分为定性和定量两种类型。
The Index layer is formed by a number of indicators, divided into qualitative and quantitative.
指标层由准则层下的各项指标因子组成，分为定性和定量两种类型。
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