According to the law of kirchhoff, the emissivity equals to the absorption rate when the material is at the condition of thermal equilibrium.
根据基尔霍夫定律，在热平衡状态下，材料的发射率等于它的吸收率。
According to the law of kirchhoff, the emissivity equals to the absorption rate when the material is at the condition of thermal equilibrium.
根据基尔霍夫定律，在热平衡状态下，材料的发射率等于它的吸收率。
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