In the case of ideal operational amplifier, circuit analysis was simplified by the ideal summing point restraints of zero voltage and zero current at the inverting input.

对于理想的运算放大器而言，通过倒相输入处零电压和零电流的理想求和点限制，可以简化电路分析过程。

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There is voltage to ground between ground part of electric equipment and point of zero electric potential of earth.

电气设备的接地部分与大地零电位点之间存在对地电压。

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Based on switch function model of TCSC and MATLAB, the digital simulation method in researching zero-crossing point characteristic of the capacitor voltage is put forward.

该文基于TCSC的开关函数模型并借助MATLAB仿真工具，提出了研究电容电压过零点特性的数字仿真方法。

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