工程立项就是对整个工程进行了各方面的评估之后认为可以进行才会有工程立项，在工程立项之前对各个方面的评估应该就包括了工程概算。工程概算是指完成这项工程，预估需要进行的成本投资。
而工程造价制约效果的好坏常受到多方面因素影响，立项、设计、施工、竣工等每个过程都会影响到造价的高低。
While the quality of engineering cost control effect is often influenced by many factors, the project, design, construction, completion and so on each process would affect the level of the cost of.
工程项目评估是投资决策和项目立项的主要依据。
Engineering project Evaluation is the main basis for capital investment decision and approving and initiating a project.
工程预可行性分析是桥梁和隧道建设前期工作的重点组成部分，往往成为项目立项的控制性因素。
Project pre-feasibility analysis, a crucial part of bridge and tunnel preparatory work construction, often becomes a controlling factor of a project.
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