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jan 1, 1900 - 20C 航运技术进一步提高（突出表现：航海雷达&海事卫星通信系统） 船舶制造趋势：大型化、专业化、高速化、自动化 20C以来 西方国家逐渐建设新城，疏解中心城市人口，改善城市居民的居住环境 集中供暖和制冷得到推广，私人卫生间等快速普及 电车、汽车、自行车得到普及 城市交通呈现多样化、立体化趋势

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人教版高中历史|Chinese students' PEP SENIOR HIGH HISTORY TEXTBOOKS

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jan 1, 1900
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~ 125 years ago
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