【单选题】【消耗次数：1】
构成双代号网络图的三要素不包括（）。
①
回路
②
节点
③
箭线
④
线路
参考答案：
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相关题目
【单选题】
箭线式网络图中的关键线路是指（）
①
具有结点数目最多的线路
②
从始点出发，由各个关键活动连续相接，直到终点的线路
③
具有活动数目最多的线路
④
具有活动数目最少的线路
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