化学势，从基本方程上说，就是A对N的偏导，因此对A取N偏导，因此化学势也能，用正则配分函数表示。
The chemical potential from the fundamental equation up here is the derivative of a with respect to the number of particles.
由配分函数求出二元系统的物态方程和偏超额化学势。
Then the equation of state and partial excess chemical potential for binary system is developed.
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