This paper introduces the classification of agricultural information resources free of charge, search methods and free database of domestic and foreign.
介绍了免费农业信息资源的分类、检索方法以及国内外重要的免费数据库。
Discusses free retrieval methods of standards literature on Internet and introduces search skills on Web in details. Retrieval methods are also analyzed.
探讨网上免费检索标准信息的方式，详细论述各网站的检索方法，并对各种检索方式作了评析。
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