Is a method of constructing a project schedule network diagram that uses boxes or rectangles,referred to as nodes,to represent a

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问题 Is a method of constructing a project schedule network diagram that uses boxes or rectangles,referred to as nodes,to represent activities and connects them with arrows that show the dependencies.
    This method includes following types of dependcies or precedence relationships.
    (1),the initiation of the successor activity,depends upon the completion of the predecessor activity.
    (2),the initiation of the successor activity,depends upon the initiation of the predecessor activity.
(2)

选项 A、F—S
B、F—F
C、S—F
D、S—S

答案D

解析 前导图(PDM)是以一种构建项目进度网络图的方法,它用方块或矩形(称为节点)来代表活动,并将节点用箭头连接起来,以表达节点之间的逻辑关系。
    这种方法包含下列依赖或前导关系:
    F—S,后续活动的开始依赖于前导活动的完成。
    S—S,后续活动的开始依赖于前导活动的开始。
    好多同学看完(66)题的第一反应:这是在描述AON(Activity On Node),但是选项中只有AOA,怎么办?
    好在AONL还有个外号叫PDM(Precedence Diagramming Method,前导图),此外,它还叫单代号网络图。
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