The F-H theorem is one of the common methods to evaluate mechanical mean value in quantum mechanics. In this paper, the application of F-H theorem in evaluating the mean value of mechanical quantity is discussed.%F-H定理是量子力学中求解力学量平均值常用的一种方法，本文重点论述了F-H定理在求解力学量平均值上的应用。
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