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per·mit·tiv·i·ty AHD[pûr'mĭ-tĭvʹĭ-tē] D.J.[ˌpɜːmɪˈtɪvɪtiː]K.K.[ˌpɝmɪˈtɪvɪti]n.（名词）【复数】 per.mit.tiv.i.ties 【物理学】 - A measure of the ability of a material to resist the formation of an electric field within it. Also called dielectric constant ,relative permittivity 介质常数，电容率：一种物质抵制在其内部建立的电场能力的量度 也作 dielectric constant,relative permittivity
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