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设计时速350公里！这条高铁最大断面隧道贯通
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简介设计时速350公里。6月4日，◎ 科技日报记者 何亮记者从国铁成都局获悉，为单洞双线结构，棕树坡隧道位于四川省乐至县境内，成渝中线高铁最大开挖断面隧道——棕树坡隧道顺利贯通。图片来源：国铁成都局成渝中...
设计时速350公里。6月4日，
图片来源：国铁成都局
◎ 科技日报记者 何亮
记者从国铁成都局获悉，为单洞双线结构，
棕树坡隧道位于四川省乐至县境内，成渝中线高铁最大开挖断面隧道——棕树坡隧道顺利贯通。
图片来源：国铁成都局成渝中线高铁是我国“八纵八横”高铁网沿江通道的重要组成部分，
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