外部市场调研主要采用问卷调查、文案研究、深入访谈和二手资料研究等方法；
Outside market survey adopted questionnaire investigation, case study, deep interview and the study of second-hand materials etc.
网络市场调研具有快速、低成本、多媒体等优点，也有样本代表性差、问卷反馈不确定等缺点。
Internet marketing have advantages such as quick response, lower cost, multimedia method and so on.
网络市场调研具有快速、低成本、多媒体等优点，也有样本代表性差、问卷反馈不确定等缺点。
Internet marketing have advantages such as quick response, lower cost, multimedia method and so on.
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