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真空介电常数
chem. permittivity of free space; permittivity of vacuum
el. vacuum permittivity
el.mach. absolute permittivity
真空介电常数电容率
auto. permittivity of vacuum
真空介电常数电容率
magn. permittivity of vacuum
真空介 电 常数: 1 phrase in 1 subject
Electric machinery1