How to assure the appearance and configuration of concrete lined tunnel is a key point, and also a difficult point for chamber construction.
如何保证隧洞形体和混凝土外观是洞室施工的一个重点，也是一个难点。
How to assure the appearance and configuration of concrete lined tunnel is a key point, and also a difficult point for chamber construction.
如何保证隧洞形体和混凝土外观是洞室施工的一个重点，也是一个难点。
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