When multistage amplifier has double-input double-output differential circuit, the two methods produce different calculating results.
多级放大器的放大倍数的计算有两种基本方法，但当多级放大器中含有双入双出型差动电路时。
The paper discusses an artificial intelligent control means which is particularly used in the liquid level control system with double input and double output.
本文讨论了一种仿人智能控制方法，并将其具体应用于二输入、二输出的液位控制系统。
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