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DOI：10.3969/j.issn.1004-874X.2008.05.026
Author NameAffiliation
李和平, 王月影, 王剑阁 河南农业大学牧医工程学院,河南,郑州,450002
尉氏县第一职业中专,河南,尉氏,452170 
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