项目进度管理经常采用箭线图法,以下对箭线图的描述不正确的是 ( ) 。
- A.流入同一节点的活动,有相同的后继活动
- B.虚活动不消耗时间,但消耗资源
- C.箭线图中可以有两条关键路径
- D.两个相关节点之间只能有一条箭线
正确答案及解析
正确答案
解析
箭线图是用箭线表示工作、节点表示工作排序的一种网络图方法。在箭线图表示法中,有三个基本原则:第一,网络图中不会有相同的代号;第二,两个相关节点之间只能有一条箭线;第三,流入流出同一节点的活动均有共同的后继活动或先行活动。出于鉴别目的,人们引入了一种额外的节点,它表示一种特殊的活动,叫做虚活动。它不消耗时间,当然也不消耗资源。因此,B是错误的。关键路径是历时最长的路径,关键路径不止一条,虚活动有时也会在关键路径上。可见C是正确的。
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