Secondly, the author carried out a survy at three levels of Kunming Municipal Public Security Bureau. In this survey, 512 questionares were delivered, of which 412 were collected.
其次，采取分层抽样，对昆明市公安局三级公安机关民警进行问卷调查，共发放问卷512份，回收问卷412份。
参考来源 - 昆明公安内部信息资源共享障碍与对策的实证研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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