N this paper, four factors method for calculating the first-order linear circuit is proposed. Concerned with the forced response in this method, two kinds of new calculating methods are presented.
本文提出了计算一阶线性电路的四要素法，对该法中的强制响应提出了两个新的计算方法；
Raw materials for producing tipping base paper, quality index, the production process and operation method, and equipment performance of paper machine are four respects of the influence factors.
生产水松原纸所使用的原料、纸张的质量指标、生产工艺和操作方法、纸机的装备性能是影响因素的四个方面。
Method: The orthogonal test of four factors at three different levels were used.
方法：采用四因素三水平的正交试验法，筛选静脉穿刺涂剂的配方。
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