The GERT network can solve not only the project time optimization problem in making bridge construction plan, but also the cost optimization in the limit of proper project time and resource.
随机网络不仅可以解决桥梁施工计划的工期优化问题，而且在合理工期和限定资源条件下，可进行施工成本优化。
Generally speaking, the rationality of landscape pattern decreased. It needs optimization plan and construction.
总体来看景观格局的科学合理性下降，需要进行优化规划和建设。
According to the construction cost plan, cost program evaluation and time-cost optimization are used to control the project cost.
根据施工项目的成本计划，运用成本计划评审法和时间成本优化法对项目成本进行控制。
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