以可靠度为目标，建立了一种备件需求模型，提出了迭代计算过程。
Then take reliability as the goal, established one kind of spare parts demand model, proposed the computation process.
该方法在迭代计算过程中将交流系统方程和直流系统方程分别进行迭代求解。
In the process of iterative calculation, it solves AC equation and DC equation respectively.
本文对于矩形区域上某一内点为奇点的奇异积分的近似计算给出了优化中心数值算法，它在迭代计算过程中避免了函数值的重复计算。
This paper presents an optimum numerical algorithm of center rule for the approximate evaluation of singular integrals over rectangular domains with a inner singularity.
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