Shanghai people's square undergroundmark is studied as an example, data are collected through questionnaire survey and sorted out, and factor analysis method is then used.
Prior to construction, delineate and mark all property boundaries and underground utilities.
在建造之前，画出并标出所有的财产边界和地下设备。
3
Power cable route protection zone: the areas between two parallel lines formed by 0.75 meters on both sides of the ground mark of underground cable route;