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“暗十八盘”之称的叠彩洞19个隧道连接豫晋，首尾相连，洞内S弯
“暗十八盘”之称的叠彩洞19个隧道连接豫晋，首尾相连，洞内S弯，怎一个险字了得，这些公路隧洞呈螺旋式上升之势，又隐藏在悬崖峭壁之间，其中六号洞是众多叠彩洞中的一大杰作，全长406米。它有两个特点：其一，它是一个U形的隧洞，入口和出口在山体的同一侧面，上下落差为20米
地上看山西10/50
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