混凝土结构是应用非常广泛的一种结构形式，但是由于其结构自身和使用环境的特点，使得混凝土存在严重的耐久性问题。
The concrete structure, which is a widely used structural form, has serious durability problem because of the features of the structure of itself and the working environment.
文中介绍了胶原基人工皮肤的特点、应用形式和国内外的研究情况。
In this article, the characteristics, the forms of application and the research situation both home and abroad about the collage based artificial skin are represented.
笔者通过对某PM C自执行项目中进度管理策划以及应用分析，论述了PMC模式下进度管理的形式和特点。
This article analyzes the application of schedule management in a PMC self - performance project with living examples and proposes the schedule methodology in the characteristics of a PMC mode.
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