There are three basic classes of the component: activity class, project class and arrow network tools class.
该组件有三个基本类：工序类、工程类及网络计划工具类。
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 this paper, based on object-oriented technique, an applied arrow network model is studied and a component of arrow network tools is developed.
作者结合面向对象的设计思想，提出了一种实用的网络计划模型，并实现了实用网络计划工具类组件。
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 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。
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