On our way home yesterday, we talked about______subjects as the weather.A．thoseB．theseC．th

, the data mining techniques are introduced broadly including its producing background, its application and its classification. The principal techniques used in the data mining are surveyed also, which include rule induction, decision(67), artificial(68)network, genetic algorithm, fuzzy technique, rough set and visualization technique. Association rule mining, classification rule mining, outlier mining and clustering method are discussed in detail. The research achievements in association rule, the shortcomings of association rule measure standards and its(69), the evaluation methods of classification rules are presented. Existing outlier mining approaches are introduced which include outlier mining approach based on statistics, distance-based outlier mining approach, data detection method for deviation, rule-based outlier mining approach and multi-strategy method. Finally, the applications of data mining to science research, financial investment, market, insurance, manufacturing industry and communication network management are introduced. The application(70)of data mining are described.

A．intractable

B．emerging

C．easy

D．scabrous

A．made

B．created

C．nucleus

D．neural

A．file

B．article

C．documents

D．literature

某段时间内某磁盘将要被访问的磁道号为28、32、87、134、96、15，设初始时从50号磁道开始向磁道号增加方向访问。若采用扫描算法(SCAN)，则平均寻道长度约为(1)。

A．20.7

B．33.8

C．41.2

D．65.3

Email收件人的标识即Email地址，它具有(3)，地址中(3)。

A．唯一确定性 可以有空格

B．唯一确定性 无空格

C．不唯一性 可以有空格

D．不唯—性 无空格

数据库主要有(30)两大类操作。

A．插入和删除

B．修改和删除

C．检索和更新

D．检索和修改

软件是由(36)组成。

A．程序，数据和文档

B．程序和数据

C．源代码，数据和结果

D．源代码，数据和文档

欲将表“学生”中的信息先按学号升序排序，再按平均成绩升序排列，其正确命令是(45)。

A．SELECT * FROM 学生 ORDER BY 学号 ASC，平均成绩 ASC

B．SELECT * FROM 学生 ORDER BY 平均成绩 ASC，学号 ASC

C．SELECT * FROM 学生 ORDER BY 学号 DESC，平均成绩 DESC

D．SELECT * FROM 学生 ORDER BY 平均成绩 DESC，学号 DESC

网络安全具有几方面的特性：(49)指的是数据未经授权不允许进行改变。

A．完整性

B．可用性

C．可控性

D．保密性

A．配置管

B．故障管理

C．安全管理

D．性能统计