本文主要采用典型抽样法，选取南宁市14座具有代表性的城市立交桥作为重点研究对象。
This paper USES the typical sampling method, selection of Nanning city block 14 has the representative city overpass bridge as the research object.
本文主要采用典型抽样法，选取南宁市14座具有代表性的城市立交桥作为重点研究对象。
This paper USES the typical sampling method, selection of Nanning city block 14 has the representative city overpass bridge as the research object.
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