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本文论述了ＨＦＣ－１３４ａ状态方程的发展，对几个重要的方程式与实验数据进行了比较，发现Ｐｉａｏ方程式是工况范围内最佳关系式．
In this paper, the development of the HFC-134a state equation is discussed. Several important equations and experimental data are compared. It is found that the Piao equation is the best one in the working condition.