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.
方案的编制应将重点放在开发建设项目的可行性研究阶段，水土保持方案要对主体工程设计提出约束条件。
The plan should be made in the feasibility study stage so that restriction conditions are given by the water and soil conservation plan to the design of main part of the project.
随着国家项目审批制度的逐步完善，我国对大型工程建设项目的工程可行性研究也越来越重视。
With the system of project examination improving gradually, our government pays more and more attention to the feasibility research of large construction projects.
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