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1. College of Education, Hebei Normal University, Shijiazhuang 050024, China;
2. School of Humanities and Social Sciences, Beijing Forestry University, Beijing 100083, China;
3. Qinhuangdao No.1 Senior High School, Qinhuangdao 066006, China;
4. Institue of Chemical Education, Northeast Normal University, Changchun 130024, China |
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