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这儿还有真空中的介电常数，看，全在这里。
There is the permittivity vacuum. It is all up there.
youdao
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真空中的介电常数是。
This is the permittivity of vacuum.
youdao
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0是真空中的介电常数。
Epsilon zero is the permittivity of vacuum.
youdao
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0是真空中的介电常数。
Epsilon zero is the permittivity of vacuum.
youdao