求解某项工程计划的AOE网的关键路径。输入数据建立AOE网络，计算每一个事件的Ve和Vl，每一个活动的e和l，求出该项工程的所有关键活动和非关键活动，进而求得关键路径。-Solving the critical path of a project AOE network. Input data setup AOE network, compute Ve and Vl every event, every event e and l, find all the key activities and non-critical activities of the project, and then obtain the critical path.