在一个电路简化后（如电阻的串并联，电容的串并联，电感的串并联化为一个元件），只含有一个电容或电感元件（电阻无所谓）的电路叫一阶电路。主要是因为这样的电路的Laplace等效方程中是一个一阶的方程。
应用四要素法对周期信号和非周期信号激励的一阶电路作了较详细的分析；
The traditional three factors method ford-c first-order linear circuit is only one special example of the new method being discussed.
一阶电路在任意激励下的零状态响应，既可以用卷积积分法，也可以用三要素法进行分析与计算。
The zero state response to an arbitrary excitation in a fist order circuit can be solved by either the convolution integral or the three element method.
本文论述了集合上的度量、度量空间的性质、度量拓扑、可度量化空间、完备度量空间、及一阶电路中的度量空间。
The measurement in set theory, the properties of Metric Space, measurement Topology, Measurable Space, Perfect Metric Space and its application in first order circuit are explored in this paper.
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