2004年12月28日，我国第一条城际铁路-合宁铁路（合肥至南京）正式开工建设，建成后，合肥至南京的铁路运行里程将由目前的312km缩短至154km，设计时速是现行时速的2.5倍。旅客-八年级数学

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