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“十一”黄金周,张三、李四等六个同学相邀经兰新铁路从西安到新疆考察“西气东输”工程.据他们了解,从2000年开工的“西气东输”工程就是我国新疆塔里木气田开采的天然气,历经九个省、市、自治区送往经济发达的长江三角洲地区,全长4200千米,2003年将阶段通气,2004年会全线贯通.进入东部的天然气40％用于发电,其它用于化工和民用.这项巨大的工程无论是从经济效益、环保效益看都将是巨大的.请回答下列有关问题.
During the “11th” Golden Week, six students including Zhang San and Li Si invited the Lanzhou-Xinjiang Railway to investigate the “West-East Gas Transmission” project from Xi’an to Xinjiang. According to their understanding, the “West-East Gas Transmission Project” started in 2000. The project is natural gas extracted from the Tarim gas field in Xinjiang, China. It has passed through nine provinces, municipalities, and autonomous regions to the economically developed Yangtze River Delta region. The total length is 4,200 kilometers. It will be ventilated in 2003, and will be completed in 2004. % is used for electricity generation, other for chemical and civil use. This huge project will be huge in terms of economic and environmental benefits. Please answer the following questions.