通过交、直流电路在使用基尔霍夫方程组解题的分析讨论，可知回路电压方程采用网孔法比较准确，不易出错。
When using mesh, closed circuit voltage equation groups will be more exquisite, direct complex circuit is the special case of alternating complex circuit.
基于基尔霍夫标量衍射理论，采用光线追迹法设计了连续型平面衍射聚光透镜掩模。
According to Kirchhoff's scalar diffraction theory, with the ray tracing method, a continuous relief mask for diffractive focus lens has been designed.
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