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我國自主研制最大直徑泥水平衡盾構機下線(xiàn)

2018-09-30 06:00來(lái)源：新華網(wǎng)

9月29日，我國自主研制最大直徑泥水平衡盾構機下線(xiàn)儀式在河南鄭州舉行。新華社記者馮大鵬攝

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[責任編輯：劉曉宇]

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