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Trắc nghiệm: The basic elements of public-opinion research are interviewers. questionnaires. tabulating equipment. and to sample population,The basic elements of public-opinion research are interviewers. questionnaires. tabulating equipment. and to sample population.

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The basic elements of public-opinion research are interviewers. questionnaires. tabulating equipment. and to sample population, The basic elements of public-opinion research are interviewers. questionnaires. tabulating equipment. and to sample population.

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