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DOI：10.3969/j.issn.1004-874X.2009.12.093
Author NameAffiliation
朱丽琴, 王生林, 刘冠明 甘肃农业大学经济管理学院,甘肃,兰州,730070
仲恺农业工程学院农业与园林学院,广东,广州,510225 
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