本文以桥梁仿真分析技术为主线，以整治效果为目标，以荷载试验和长期观测为检验手段，建立了既有钢桥裂纹安全检测评估系统。
Based upon finite element simulation analysis, load tests and long-term observation, a detection and evaluation system for old steel bridge safety was developed in this thesis.
本论文以劳动力市场供求分析为主线，从供求两方面对我国残疾人就业保障问题进行分析。
The article applies labor market supply-demand analysis as main studying method, analyzing the employment security of the handicapped in China through two aspects of supply and demand.
全文共分四个章节，以对城市休闲空间的研究和分析为主线，结合城市旅游的相关问题进行系统的论述。
The research and analysis on the urban recreation space is the main line, interspersed with related questions of urban tour.
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