Outside market survey adopted questionnaire investigation, case study, deep interview and the study of second-hand materials etc.
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；
In chapter one, the history, method of study, materials and application of magnetorheological fluids are reviewed and the problems of investigation are pointed out.
第一章中，我们全面介绍了磁流变液的历史，研究方法，磁流变材料及其应用，指出了磁流变液研究中存在的一些问题。
It has proved to be an exceedingly rich source of information for exploring the structure of molecules in solution, for the investigation of solid materials, and for the study of molecular dynamics.
核磁共振对于探查溶液中的分子结构，研究固体材料以及分子动态已证明具有极丰富的信息来源。
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