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市场调查的质量问题主要来自非抽样误差 ,要解决质量问题 ,必须找出主要质量点 ,实行全程性、全员性、全域性和超前性控制
The quality of market research mainly comes from the non-sampling error. To solve the quality problem, we must find out the main quality points and implement full-time, full-member, global and advanced control