【摘要】 随着Internet的迅猛发展 ,Web页以指数增长 ,如何有效地对这浩如烟海的信息进行查询定位 ,早已为人们所重视。许多查询工具应运而生 ,它们依查询方式可分为虚拟图书馆 (Virtuallibraries)和查询引擎 (Searchengine)两类 ,恰当的使用它们可以方便地查询地学信息。但是 ,由于各自数据库的质量、容量及更新频率的差异 ,对于同一主题采用不同的查询方式 ,结果会有很大的差异。恰当使用查询函数 ,可以有效缩小查询范围 ,提高查询速度更多还原

【Abstract】 With the rapid development of Internet,WEB pages increase in exponential progression.How to make inquiries of the tremendous amount of information is a problem which has long aroused interest among people.As a result,lots of search tools are produced.Accoding to search forms,they may be grouped into two types:virtual libraries and search engine,whose proper utilization will make it easy to search for geoscience information.Nevertheless,due to the difference in quality and renewal of frequency among various databases,the adoption of different search forms for the same subject will produce considerably different results.The appropriate use of search functions will effectively reduce the search range and speed up the search work.更多还原