Shanghai people's square underground mark is studied as an example, data are collected through questionnaire survey and sorted out, and factor analysis method is then used.
以上海市人民广场地下商场为研究实例，通过问卷调查收集数据，并对所收集到的数据进行整理，然后进行因素分析。
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;
电力电缆线路保护区：地下电缆为线路两侧各零点七五米所形成的两平行线内的区域；
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;
电力电缆线路保护区：地下电缆为线路两侧各零点七五米所形成的两平行线内的区域；
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