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.
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。
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