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本文对网络图的组成要素从概念上予以澄清，批驳了各种不科学的定义和说法，对双代号网络图节点时间参数给予明确概念，纠正了关于工序时间参数计算中的不合逻辑的计算顺序以及没有实际意义的关键线路确定方法。
This article clarifies the concept of network components and refutes various unscientific definitions and explanations. It gives a clear concept of time parameters of network nodes in double-code, and corrects the illogical calculation order of calculation of process time parameters As well as no practical means of determining the key lines.