http://epub.cnki.net/grid2008/docdown/docdownload.aspx?filename=GSNY200512140&dbcode=CJFD&year=2005&dflag=pdfdown
epub.cnki.net
全网免费
http://doc.paperpass.com/journal/20050435gsny.html
doc.paperpass.com
全网免费
http://www.cqvip.com/Main/Confirm.aspx?id=20668447
维普网
全网免费
http://www.zhangqiaokeyan.com/academic-journal-cn_gansu-agriculture_thesis/020122873414.html
掌桥科研
全网免费