In the activity-on-arrow network, there are essential differences between positive activity and dummy activity.
双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。
In the activity-on-arrow network, there are essential differences between positive activity and dummy activity. The main function of dummy activity is to transfer the logical relationship in the work.
在双代号网络图中，虚工作和实工作有着本质的区别，其主要作用是传递工作之间的逻辑关系。
In view of activity-on-arrow network drawing difficultly, describes the methods of determine the dummy arrow. It will enable the rapid and accurate drawing.
针对双代号网络图绘制困难的问题，介绍了绘图时虚箭线的判定方法，有利于快速、准确地成图。
In view of activity-on-arrow network drawing difficultly, describes the methods of determine the dummy arrow. It will enable the rapid and accurate drawing.
针对双代号网络图绘制困难的问题，介绍了绘图时虚箭线的判定方法，有利于快速、准确地成图。
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