Construction of concrete lining at the time of the basic lofting lofting method consistent with the excavation.

混凝土衬砌时的施工放样基本与开挖放样方法一致。

youdao

Construction of concrete lining at the time of the basic lofting lofting method consistent with the excavation.

混凝土衬砌时的施工放样基本与开挖放样方法一致。

youdao