kirch 网络等效电阻问题 给定一个由n 个结点构成的网络电路，结点编号为1，2，…，n。结点间连接着m个电 阻。网络等效电阻问题要求计算结点1和n 之间的等效电阻。-kirch equivalent resistance network of a given problem of n nodes of a network circuit, nodes numbered 1,2, ..., n. Connected between nodes m-resistance. Problem r