众所周知，“虚短”和“虚断”是模拟电子技术中分析运放电路的重要手段. 然而，作者在多年的教学与实践中发现，该方法同样可以巧妙地用于“电路分析基础”中谐振相关问题的分析，而且该技巧简单直观，可以免去复杂的复数运算，应用起来方便快捷. 本文通过理论分析和实例验证了所提方法的有效性，在相关电路分析中具有一定的价值.

As we all know, “virtual short” and “virtual break” are important methods to analyze operational amplifier circuit in analog electronic technology. However, we have found in many years of practice and teaching that this method can also be skillfully applied to the analysis of some resonance problems in the basis of circuit analysis. Moreover, this technique is simple and intuitive, and it can avoid many complicated calculations. So it is convenient and fast to apply. In this paper, the practicability of the proposed method is verified by theoretical analysis and practical examples, and it has much value in related circuit analysis.