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若宝成铁路秦岭段按 20‰ 坡度标准修筑会是何种面貌？ - 知乎
source link: https://www.zhihu.com/question/322933358/answer/672579252
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按照我国其他铁路的做法，如果是20‰坡度，那么秦岭大隧道可能更长，观音山的展线更绕，同样需要更长的隧…
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