The equations are extra nonlinear differential equations. the dexter function is not continuous in field of real number .

该方程右边的函数在实数域内不连续，是一个高度非线性微分方程组。

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The sum formulas of several kinds of ordinary series with function term are deduced by using the method of solving linear differential equation.

本文试应用求解一阶线性微分方程的方法导出几类常见的函数项级数的求和公式。

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Objective: The significance of clinical manifestations and pulmonary function test in differential diagnosis of asthma from COPD in elderly was investigated.

目的：探索老年哮喘与慢性阻塞性肺疾病（COPD）临床特征的区别和肺功能检查在鉴别诊断中的重要性。

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