下列协议中与Email应用无关的是（ ）
A.MIME
B.SMTP
C.POP3
D.Telnet

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  B.语义分析
  C.代码生成
  D.出错处理

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• In the fields of physical security and information security, access control is the selective restriction of access to a place or other resource. The act of accessing may mean consuming, entering, or using. Permission to access a resource is called authorization （授权）．
  An access control mechanism （71） between a user （or a process executing on behalf of a user） and system resources, such as applications, operating systems, firewalls, routers, files, and databases. The system must first authenticate（验证）a user seeking access. Typically the authentication function determines whether the user is （72） to access the system at all. Then the access control function determines if the specific requested access by this user is permitted. A security administrator maintains an authorization database that specifies what type of access to which resources is allowed for this user. The access control function consults this database to determine whether to（73）access. An auditing function monitors and keeps a record of user accesses to system resources.
  In practice, a number of（74）may cooperatively share the access control function. All operating systems have at least a rudimentary（基本的）, and in many cases a quite robust, access control component. Add-on security packages can add to the（75）access control capabilities of the OS. Particular applications or utilities, such as a database management system, also incorporate access control functions. External devices, such as firewalls, can also provide access control services.
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  B.native
  C.controlled
  D.automated

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  A.文档测试需要仔细阅读文档，检查每个图形
  B.文档测试需要检查文档内容是否正确和完善
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• 修改现有软件系统的设计文档和代码以增强可读性，这种行为属于（）维护。
  A.正确性
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  C.完善性
  D.预防性

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  A.代码生成
  B.语法分析
  C.语义分析
  D.出错处理

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