ArchiveVolume 6, Issue 6, December 2018
Yuan Yuan, Ruonan Liu, Yichuan Yuan
Pages: 123-128     Published Online: Jan. 23, 2019
DOI: 10.11648/j.sjedu.20180606.11        Views 337      Downloads 46
Gayane Suren Poghosyan, Anahit Movses Gasparyan, Diana Hamayak Grigoryan
Pages: 129-133     Published Online: Jan. 28, 2019
DOI: 10.11648/j.sjedu.20180606.12        Views 306      Downloads 25
Youling Wan, Huiling Wu
Pages: 134-139     Published Online: Feb. 14, 2019
DOI: 10.11648/j.sjedu.20180606.13        Views 285      Downloads 25
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