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本文来源:曼朗 发布时间:2015-06-03 分享:
1、上海网站推广介绍按信息的组织方式可分为范畴层次搜索引擎(或目录式分类搜索引擎),词语搜索引擎两大类。而范畴层次搜索引擎通常带有关键词索引,词语搜索引擎通常带有范畴层次索引,以弥补分类法和主题法各自的不足。
2、上海网络推广介绍按覆盖范围可分为通用搜索引擎和专业性搜索引擎。
3、上海网站推广介绍按引擎功能可分为常规搜索引擎(或称独立搜索引擎)和多元搜索引擎两大类。常规搜索引擎有单一的功能,搜索时通常只检索自己的数据库,并根据数据库内容反馈出相应的查询信息或链接站点。多元搜索引擎是多个单一引擎的组合,对同一个查询可同时在多个搜索引擎上查询,或组合指定的搜索引擎查询,或在单一搜索引擎上查询,但可综合输出查询结果,也可分别输出每个搜索引擎的查询结果。
上海网站建设推广介绍一个完整的internet搜索引擎主要由机器人、索引库和用于检索索引库的机器人自动在Web上按某种策略进行远程数据的搜索和获取,并生成本地索引,由此产生一个数据库。
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