permittivity constant 基本例句 介电常数 The strain layer is composed of a high dielectric constant material.应变层是由一个高介电常数的材质所构成。 Relative dielectric permittivity and loss angle tangent among them are the two of most important indexes.相对介电常数和介质损耗角正切是其中的两个重要的性能指标。