Among various kinds of empty space under subgrade, gob in coal mines, is a frequently happened phenomenon in the highway survey, design and construction work.
在高速公路勘察设计和施工过程中,经常会遇到设计路基下方存在各种类型的空洞,如煤矿采空区等。
Among various kinds of empty space under subgrade, gob in coal mines, is a frequently happened phenomenon in the highway survey, design and construction work.
在高速公路勘察设计和施工过程中,经常会遇到设计路基下方存在各种类型的空洞,如煤矿采空区等。
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