指出在考虑施工活动持续时间不确定的条件下，开展施工网络进度计划和优化研究，具有实际意义；
The research on risks and optimization of the construction network program is of significance when the lasting time of the construction is uncertain.
网络计划技术是施工项目管理中行之有效的一种管理方法，在进度计划与管理中得到了广泛地推广与应用。
Network planning technique is an effective manner in construction project management which is popularized and applied widely on progress plan and management.
图上可直接展示施工进度网络计划的各时间参数，特别是各工作的总时差和自由时差。
The each time parameter of construction schedule network planning in the graph may be exposed immediately, the total float and the free float of each work especially.
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