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Received:March 07, 2018  Revised:March 07, 2018
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Author NameAffiliationE-mail
LIMUYAO 首都师范大学第二附属中学 275901963@qq.com 
GAOYU 北京化工大学  
GUOYISHUO 北京化工大学  
WANGRUNGUO* Beijing University of Chemical Technology wangrunguo@126.com 
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