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http://www.caac.gov.cn/XXGK/XXGK/MHGZ/201511/P020151103350074692735.pdf
http://www.caac.gov.cn/XXGK/XXGK/MHGZ/201511/P020151103349968363817.pdf
http://www.caac.gov.cn/XXGK/XXGK/MHGZ/201610/P020161101542644153994.pdf