试题与答案

2008年7月,育英中学举办迎奥运绘画展,小鹏所绘长为90cm,宽为40cm的图

题型:解答题

题目:

2008年7月,育英中学举办迎奥运绘画展,小鹏所绘长为90cm,宽为40cm的图画被选中去参加展览,图画四周加上等宽的金边装裱制成挂图后,图画的面积是整个挂图面积的72%,你知道金边有多宽吗?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A, B, C, D

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题型:单项选择题

One of the difficulties in building an SQL-like query language for the Web is the absence of a database () for this huge, heterogeneous repository of information. However, if we are interested in HTML documents only, we can construct a virtual schema from the implicit structure of these files. Thus, at the highest level of () , every such document is identified by its Uniform Resource Locator (URL), has a () and a text. Also, Web servers provide some additional information such as the type, length, and the last modification date of a document. So, for data mining purposes, we can consider the set of all HTML documents as a relation: Document(url, title, text, type, length, modif)Where all the () are character strings. In this framework, an individual document is identified with a () in this relation. Of course, if some optional information is missing from the HTML document, the associate fields will be left blank, but this is not uncommon in any database.

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B.title

C. driver

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