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 <p>3月20日，山东济南，航天大道穿黄隧道南线盾构顺利贯通。图为施工现场。该穿黄隧道工程位于济南市高新区、新旧动能转换起步区，项目全长3888米，采用双向6车道城市主干路标准，设计时速60公里。</p>

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