创建链表的详细、简练、精准的方法，（本人看到其他书上关于链表的创建太过麻烦，故编写这个程序，供初学者学习）-Methods detailed, concise, accurate to create lists(I see other books created on the list is too cumbersome, so write this program, for beginners to learn)

很精准的潮流计算，适合100节点内的的潮流计算-power flow