Author of the article:JIANG Yafeng1, WANG Liwen2, YAN Xuelin3, BU Ning4
Author's Workplace:(1. Beizhen of High School, Beizhen Manchu Autonomous County, Liaoning Province 121300; 2. Shenyang Normal College, Shenyang 110034; 3. Fengcheng County No.1 High School, Fengcheng County, Liaoning Province 118100; 4. Fushun Teachers College, Fushun City, Liaoning Province 113006)
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