The system marginal price can be obtained without the optimal flow calculation, so there is no convergence problem and the cost revision is not necessary.
不必求解系统最优潮流就可以得到系统边际电价，因而不存在收敛性问题，也不必进行费用修正。
The main reason for this phenomenon are teaching the process of reform, there is no better deal with the beginning of high school chemistry teaching convergence problem.
造成这一现象的主要原因是教学改革过程中，没有处理好初高中化学教学衔接的问题。
The main reason for this phenomenon are teaching the process of reform, there is no better deal with the beginning of high school chemistry teaching convergence problem.
造成这一现象的主要原因是教学改革过程中，没有处理好初高中化学教学衔接的问题。
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