单项选择题 WebSQL is a SQL-like （1） language for extracting information from the web. Its capabilities for performing navigation of web （2） make it a useful tool for automating several web-related tasks that require the systematic processing of either all the links in a （3）, all the pages that can be reached from a given URL through （4） that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common （5） Interface.

单项选择题 某校园网用户无法访问外部站点210.102.58.74，管理人员在windows 操作系统下可以使用（）判断故障发生在校园网内还是校园网外。

单项选择题 “seience”是一个XML 元素的定义，其中元素标记的属性值是（）。