【摘要】 给出"设备经济寿命的唯一性"的应用,用和函数作图法给出"净年值曲线有最大值点"的证明,并通过实例说明该方法更客观、更合理,具有一定的应用价值。更多还原

【Abstract】 In this paper the application of uniqueness of economic equipment life-span was proposed and the proof that net yearly output curve is of the maximum point with sum function graphic method was given.The paper illustrated through examples that this method is more objective and reasonable,and has certain application value.更多还原