There is the permittivity vacuum. It is all up there.
这儿还有真空中的介电常数，看，全在这里。
The study on the effective permittivity of mixed solution is an important work to Microwave-Chemistry.
介质混合物的等效介电系数是微波化学研究中的一个重要内容。
The study on the effective permittivity of mixed solution is an important work to Microwave-Chemistry.
介质混合物的等效介电系数是微波化学研究中的一个重要内容。
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