Chapter Three: This chapter is going to set out the vital function of environmental sign system in city historic districts protection, through the analysis of home and abroad outstanding cases.
第三章：通过对国内外几个优秀案例的分析，阐述环境标识系统的设计在保护城市历史街区中所起到的重要作用。
Through LCA analysis of three road base materials and application, the performance of environment protection, technologies, applying results and economic effects have been researched.
通过对三种典型基层材料的LCA对比分析以及工程应用研究，对该种材料的环保性能、施工工艺、应用效果以及经济效益进行了研究。
Through LCA analysis of three road base materials and application, the performance of environment protection, technologies, applying results and economic effects have been researched.
通过对三种典型基层材料的LCA对比分析以及工程应用研究，对该种材料的环保性能、施工工艺、应用效果以及经济效益进行了研究。
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