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  • 1 Experimental Center, Hebei Normal University Shijiazhuang, 050016 P. R. China
  • 2 College of Chemistry, Hebei Normal University Shijiazhuang, 050091 P. R. China
  • 3 College of Chemistry and Pharmaceutical Engineering, Hebei University of Science and Technology Shijiazhuang, 050018 P. R. China
  • 4 Department of Computer, Hebei Normal College of Science and Technology Qinhuangdao, 066600 P. R. China
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