搜题请搜索小程序“爱下问搜题”
问题 填空题

请根据拼音写出相应的汉字。

diàn（ 　　）污 　点zhuì （　　 ） 　报chóu （ 　　） 　洗zhuó（ 　　）

chú（ 　　）形 　è（　　 ）运 　　  cù （ 　　）然 　　慷kǎi （　　 ）

答案

玷、缀、酬、濯、雏、厄、猝、慨

问答题

（本小题满分12分）

讨论函数f(x)的单调性；
查看答案
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 (131) 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 (132) , every such document is identified by its Uniform Resource Locator (URL), and a (133) and a text. Also, Web severs 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, rifle, text, type, length, modif)
Where all the (134) are character strings. In this framework, an individual document is identified with a (135) 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.

A．table

B．title

C．driver

D．event
查看答案