Addition of mullite short fibre can accelerate precipitation in early aging stage and speed up composite's soften rate in later aging stage, but not alter the precipitation sequence in matrix.
增强体的加入既能加速时效前期沉淀析出又可加快时效后期复合材料的软化，但不改变基体沉淀相的析出顺序，而只影响其析出速度。
As service life of buildings approaching to projected life, or their structures entering aging stage, people are gradually concerned about the health status of the structure and security estimation.
随着我国部分房屋建筑使用年限接近设计期限，或者说结构进入老化阶段，结构的健康状况和安全性评估逐步引起人们的关注。
As service life of buildings approaching to projected life, or their structures entering aging stage, people are gradually concerned about the health status of the structure and security estimation.
随着我国部分房屋建筑使用年限接近设计期限，或者说结构进入老化阶段，结构的健康状况和安全性评估逐步引起人们的关注。
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