Methods A provincial Sampling survey was carried out by questionnaire, physical examination and lab oratory examination.
方法采用问卷、体检和实验室检查方法在全省进行抽样调查。
参考来源 - 江苏省5岁以下儿童血浆维生素A水平及影响因素的研究 A Study on the Serun Vitamin A Levels and Influential Influential Factors in Children under 5 Years of AgeThe paper,by conducting a sampling survey,analyzes 5 types of differences in self-driving tourist market with different travel radius in Suzhou. The result shows there exist differences in six aspects;namely;tourist motivation,information channel;ways of travel,time for travel,time of stay and tourist consumption.
本文通过市场抽样调查方法,分析苏州市出游半径不同的5类自驾车旅游市场特征差异。
参考来源 - 基于出游半径的自驾车旅游市场特征差异分析——以苏州市为例·2,447,543篇论文数据，部分数据来源于NoteExpress
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