Designing a research plan calls for decision on the data sources, research approaches, research instrument, sampling plan, and contact method.
设计调查计划时，要确定资料来源，调查手段，抽样方法和联系方法。
Designing a research plan calls for decision on the data sources, research approaches, research instrument, sampling plan, and contact method.
设计调查计划时，要确定资料来源，调查手段，抽样方法和联系方法。
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