论文简介： Along with the world in the 20th century science, technology, economic development, transportation, water conservancy, water and electricity, mining, especially in the urban underground space traffic and the use of the tunnel on the number and difficulty of the higher demand. Massive underground construction for
Along with the world in the 20th century science, technology, economic development, transportation, water conservancy, water and electricity, mining, especially in the urban underground space traffic and the use of the tunnel on the number and difficulty of the higher demand. Massive underground construction for
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