The short run is the period of time that is long enough to adjust variable inputs, such as materials and production labor , but too short to allow all inputs to be changed.
短期运行指的是在时间上足够长去调整可变投入，例如原料和生产工人，但是因时间太短而不能改变所有的投入因素。
Law of diminishing returns — the relationship between inputs and outputs when some inputs are increased and others are fixed, eventually leading to the decreased productivity of variable inputs.
回报降低定律——在投入和产出的关系中，当投入增加其他不变，最终导致可变投入生产力降低。
The optimal inputs are given by the state feedback with the bounded variable gains.
最优输入由有界可变增益的状态反馈得到。
Based on the principles of a variable structure system a design method for the variable structure control system with a variety of reference inputs is proposed in this paper.
基于变结构控制原理，本文提出了一种变结构控制系统的设计方法，它允许多种形式的参考输入。
The simulation results prove that the three-phase phase-locked loop can work well in disturbance situation and variable frequency system when the frequency of the inputs is variable.
并对相位突变和频率突变的情况进行了仿真研究，说明在相位和频率发生变动时三相锁相环仍能有效地锁定相位，能够满足系统变频的要求。
The simulation results prove that the three-phase phase-locked loop can work well in disturbance situation and variable frequency system when the frequency of the inputs is variable.
并对相位突变和频率突变的情况进行了仿真研究，说明在相位和频率发生变动时三相锁相环仍能有效地锁定相位，能够满足系统变频的要求。
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