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分析了（Ｎ＋Ｍ）容错系统的经济性，提出了其经济性的优化模型，并利用图视化方法进行了求解，给出了一种简单实用的最佳备件量选取方法．其基本方法和结论对多机组电站中选取控制器备件量具有重要的指导意义．
The economy of the (N + M) fault-tolerant system is analyzed. An economic optimization model is proposed and solved by the visualization method. A simple and practical method for selecting the best spare parts is given. The basic method and conclusion of the multi-unit power plant controller selection of spare parts has an important guiding significance.