You can use a single source by using a combination of command-line tools and shell flow control (such as if or case) to select the various options to use.

通过使用命令行工具和外壳流控制(如if或case)的组合，您可以使用单个源来选择各种要使用的选项。

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This method is of great importance to realize on-line modeling and control of freeway traffic flow.

此方法对实现高速公路交通流的在线建模与控制具有重要意义。

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This paper studies the simulation method of tie line power flow control among areas of an interconnected network in load flow calculation.

本文对潮流计算中互联电网各区域间的联络线功率控制的模拟计算方法进行了研究。

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