The symmetry of the permittivity tensor is found to be based on the first law of thermodynamics and the non-wastage condition.
由热力学第一定律及无损条件导出了介电张量的对称性；
The symmetry of the permittivity tensor is found to be based on the first law of thermodynamics and the non-wastage condition.
由热力学第一定律及无损条件导出了介电张量的对称性；
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