近年，随着中国经济的快速发展和城市人口与各类机动车辆的急剧增加，城市交通与大气污染等问题日益突出。于是，许多大城市纷纷将目光投向了大容量、高速度、低能耗、少污染、安全又准点的城市地铁交通。 喜迎盛世，是北京市城市建设进入施工高潮。５号线，八通线工程开工建设 In recent years, with the rapid economic development in China and the drastic increase of urban population and various types of motor vehicles, problems such as urban traffic and air pollution have become increasingly prominent. As a result, many big cities have set their sights on metro transport with high capacity, high speed, low energy consumption, less pollution, safety and punctuality. Welcome prosperity, is the construction of Beijing's urban construction into the climax. Line 5, Batong project started construction