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: <math>\mathrm <math>dS = \frac{\delta Q}{T} \,\, \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \text {（封闭系统中理想状态下的可逆过程）}</math>
: <math>\mathrm dS = \frac{\delta Q}{T} \,\, \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \text {（封闭系统中理想状态下的可逆过程）}</math>