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2020, Vol. 41(13): 80-83    DOI: 10.13884/j.1003-3807hxjy.2019120196
Principles and Quality Requirements of Sample Selection in Educational Empirical Research
ZHU Yu-Jun1, WANG Xiang-Feng2*
1. College of Chemistry, Beijing Normal University, Beijing 100875, China;
2. Analysis and Test Center, Beijing Normal University, Beijing 100875, China
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