● Qne of the difficulties in building an SQL-like query language for the Web is the absence of a database __(71)__ 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 __(72)__, every such document is identified by its Uniform Resource Locator (URL), and a __(73)__ 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 documtnts as a relation:    Document (url, title, text, type, length, modif)    Where all the __(74)__ are character strings. In this framework, an individual document is identified with a __(75)__ 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.

试卷相关题目

• 1● Activity Based Costing (ABC) is an __(66)__ technique that allows an organization to determine the actual __(67)__ associated with each product and service produced by the organization without regard to the organizational structure. This chapter explains some of the uses and benefits of Activity Based Costing. We use IDEFO __(68)__ modeling in conjunction with ABC to enable more effective business __(69)__ design decisions.    In order to achieve the major goals of business process improvement, process simplification and improvement, FAA managers need to fully understand the cost, time, and quality of activities performed by employees or machines throughout an entire organization. ABC methods enable __(70)__ to cost out measurements to business simplification and process improvement.

  A.computing

  B.campaigning

  C.programming

  D.accounting

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• 2● IEEE 802.11小组公布了多个正式的WLAN标准，其中 __(64)__工作在2.4GHz的ISM 频段。在WLAN体系结构中，AP的作用是__(65)__。

  A.802.11a和802.11b

  B.802.11a和802.11h

  C.802.11b和802.11g

  D.802.11g和802.11h

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• 3● ISO 7498-2标准涉及到的5种安全服务是__(62)__。可信赖计算机系统评价准则（TCSEC）把计算机系统的安全性分为4大类7个等级，其中的C2级是指__(63)__。

  A.身份认证，访问控制，数据加密，数据完整，安全审计

  B.身份认证，访问控制，数据加密，数据完整，防止否认

  C.身份认证，安全管理，数据加密是，数据完整，防止否认

  D.身份认证，访问控制，数据加密，安全标记，防止否认

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• 4● 在CORBA体系结构中，__(61)__属于客户端接口。

  A.静态IDL Skeletons

  B.POA

  C.静态IDL Stubs

  D.动态Skeletons

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• 5● GB/T19000-2000(idt ISO 9000:2000)表示__(60)__国际标准。

  A.采用

  B.等同采用

  C.等效采用

  D.非等效采用

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