and maintaining the correct sequence of activities . a dummy activita dummy activity is assumed to have no time duration and can be ly represented by a dashed line in work . Р在一个双代号网络图中,虚工作被用来提供特殊的工作安排和保证正确的工作时间的逻辑关系,假设虚拟活动没有时间持续时间,可以用网络中的虚线表示,Р in general , dummy activities may be necessary to meet the requirements of puter scheduling algorithms , but it is important to limit the number of such dummy link insertions to the extent possible .Р通常情况下我们必须用虚工作来满足具体的计算机进度计算的要求,但在一定程度上尽可能的限制虚工作的数量也是非常重要的。Р puter scheduling systems support only work representation , either activity-on-branch or activity-on-node . a good project manager is familiar with either representationР许多计算机调度系统只支持一个网络表示,即分支上的活动或节点上的活动。好的项目经理对这两种表示都很熟悉。РUnit 10 Quality Control and Safety During Construction 第10单元施工过程中的质量控制和安全
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