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本文指出,改进节点法中存在电流变量支路的割集时避免零主元的一个充分必要条件,并据此给出了一个选主元的算法。
This paper points out that a sufficient and necessary condition for avoiding zero-principal-element when there is a cut-set of current-variable branch in the nodal method is given, and an algorithm for selecting principal components is given accordingly.