方法采用系统抽样方法，对社区4 107位居民实施问卷调查和相关指标的检测。
METHODS The systematic sampling methods were used. 4 107 residents were investigated by questionnaires and some blood indexes were examined.
第二部分运用抽样技术及交通工程的相关理论研究车辆检测器的合理布设方法。
The second part uses the technology of collecting samples and relevant theories in traffic engineering to study the method of laying vehicle detections.
经抽样检验，这样生成的紊流场的相关函数基本上符合紊流模型的相关特性，因而证实了该方法的可行性。
The correlation of so generated turbulent field is found to be in good agreement with the theoretical correlation of the Dryden model, thus the feasibility of the proposed method is verified.
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