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试比较双代号和单代号网络图的异同点。
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试比较双代号和单代号网络图的异同点。
时间：2022-04-02 17:09
关键词：
佳木斯职业学院继续教育学院
建筑工程技术
高起专
建筑施工（面授）
平时作业2
答案解析
(1)双代号网络图和单代号网络图的相同点:基本构成要素相同,即都是箭线、节点和线路。(2分)(2)双代号网络图和单代号网络图的不同点:①单代号网络图中的节点表示一项工作,而双代号网络图中的节点只是各箭线之间的连接点,代表各工作开始或结束的瞬间;②单代号网络图中的箭线仅表示工作之间的逻辑关系,而双代号网络图中的箭线表示一项工作;③双代号网络图中有用虚箭线表示的虚工作,单代号网络图中没有虚工作,但可以有虚拟的起始节点和终止节点。 (4分)
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