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。
By method of chain iteration, the amount of energy saving can be calculated with single variation of any one of four main factors.
进而用“连锁替代法”推导出上述四个因素单独变化带来的节能量。
In chapter four, the effect factors of error and how to control it are analyzed. Thevalidity and practicality of the method are proved with the example graphs.
第四章分析了误差的影响因素，以及如何控制误差，并辅以实例图表对误差进行说明，证明了这种方法的有效性和正确性；
Method: Selecting the optimum carbon sources, nitrogen sources and inorganic salt to get the optimum liquid medium recipe by the orthogonal test in three factors and four levers;
方法：采用深层培养方法，筛选出较优的碳源、氮源、无机盐，设计三因素四水平的正交试验，筛选大杯伞的最适培养基；
The four effect factors of Sulfuric acid method, including reaction time, solvent-to-solid ratio, acid-to-coal ratio, and ultrasonic, were investigated.
研究了反应时间、液固比、酸煤比、超声波四个因素对硫酸法提取效果的影响。
The effect of four factors, reaction time, solvent-to-solid ratio, acid-to-coal ratio and the water content in extraction mixture, were studied on the extraction rate of acetone-sulfuric acid method.
研究反应时间、液固比、酸煤比、提取液含水量四个因素对硫酸丙酮法提取效果的影响。
Combined with general four-node element around crack tip element, a new hybrid finite element method to study stress intensity factors for interfacial crack is introduced.
与四节点单元相结合，由此提出了一种新的求解应力强度因子的杂交元法。
During the extracting process, four main factors, namely solid: liquid ratio, immersing time, extraction temperature and extraction time were studied by using single factor analysis method.
在提取过程中，通过单因素法分析了几个主要因素：料液质量比、超声波提取功率及超声波提取时间对提取率的影响。
During the extracting process, four main factors, namely solid: liquid ratio, immersing time, extraction temperature and extraction time were studied by using single factor analysis method.
在提取过程中，通过单因素法分析了几个主要因素：料液质量比、超声波提取功率及超声波提取时间对提取率的影响。
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