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职称英语理工完形填空历年试题模拟试题补全短文概括大意词汇指导阅读理解例题习题卫生职称英语词汇指导完形填空概括大意历年试题阅读理解补全短文模拟试题例题习题综合职称英语完形填空历年试题模拟试题例题习题词汇指导阅读理解补全短文概括大意
论文作者:英语论文网论文属性:作业 Assignment登出时间:2014-06-04编辑:hynh1021点击率:16947
论文字数:4158论文编号:org201406032059129464语种:英语 English地区:中国价格:免费论文
摘要:The rapid development of underground construction, so that more and more people in different ways of living in the underground environment, and therefore meet the basic requirements based on the use of underground construction continuously higher quality requirements. From medicine, physiology, psychology and other disciplines, different perspectives, many ways to improve the underground environment of the ways and measures, including some of the more complex issue.
A Brief History of the development of underground ancient times, humans have been anti-years use of natural caves, and shelter to escape the beast. Zhoukoudian in China found that more than 50 million years ago, Peking Man lived in caves in the natural. According to Yangshao Culture and Longshan Culture found in archaeological sites, to prove that since 7000 ~ 5000 years ago, began living dug caves, from the simple bag-shaped to round or square semi-crypt, above the roof of a simple. Later, the beginning of the construction of housing on the ground, cave gradually ceased to be the main mode of living human beings. However, the ancient tombs on the ground in accordance with the construction method in underground construction. Some grain is also built in the ground, such as the Sui Dynasty in Luoyang warehouse containing Kerry. Northwest China, North China Loess Plateau region, as a result of excavation loess and climate-friendly dry cave tradition continues to this day. Estimated that there are still more than 35 million population live in the cave.
After the industrial revolution, as a result of mining and the development of transport, mines, roadways, highways, tunnels, railway tunnels have been built. London, England in 1863 into a city of the world's first underground railway. During World War II, the protection of underground construction in the superiority of attention, some veterans of the important military installations and arms factories, warehouses, etc., built in the ground, and the construction of the air-raid shelter for the residents. Since the late 50s, as a result of economic development and scientific and technological progress, the rapid increase in urban population, the increasingly serious environmental pollution, energy crisis and the existence of the danger of war and othe本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。