单选题为了防止一个事务的执行影响其他事务，应该采取

单选题以下关于病毒的说法不正确的是 (13) 。

单选题栈的输入序列是1234，要想得到4321和3421的输出序列，则应进行的运算序列分别是 (40) 和 (41) 。(进代表进栈，出代表出栈)

单选题数据仓库中的数据组织是基于( )模型的。

单选题在数据结构中，串是 (16) 。

单选题 Currently the Pentium chip or{{U}} {{U}} 71 {{/U}} {{/U}}, made by{{U}} {{U}} 72 {{/U}} {{/U}}, is the most common CPU though there are many other companies that produce processors for personal computers. One example is the CPU made by Motorola which is used in Apple computers. With faster processors the clock speed becomes more important. Compared to some of the first computers which operated at below 30 megahertz ({{U}} {{U}} 73 {{/U}} {{/U}}) the Pentium chips began at 75 megahertz in the late 1990g. As of mid 2003 speeds now exceed 3000 + megahertz or 3 gigahertz (check your local computer store for the latest speed) . It depends on the{{U}} {{U}} 74 {{/U}} {{/U}}that the chip is housed in, or the{{U}} {{U}} 75 {{/U}} {{/U}}, as to whether you are able to upgrade to a faster chip. The motherboard contains the circuitry and connections that allow the various component to communicate with each other.

单选题将Students表的查询权限授予用户U1和U2，并允许该用户将此权限授予其他用户。实现此功能的SQL语句是：______。

单选题若L是一个无表头结点的单链表，P结点既不是首结点，也不是尾结点。删除P结点的后继结点的语句是 (57) 。

单选题按通信方式，一个网络可以分为点对点传输网络和广播式传输网络两类。总线型网络和星型网分别属于 (21) 。

单选题某关系数据库中有如表1、表2所示的员工表和部门表，适合作为员工表的主键和外键的字段分别为______。 表1 员工表 员工编号 姓名 部门编号 办公电话 001 张三 10 9217 002 李四 11 9230 003 王五 30 9217 … … … … 表2 部门表 部门编号 部门名称 负责人编号 位置 10 技术部 013 十四层 11 质量部 037 十四层 12 办公室 040 十二层 … … … …

单选题For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the 35 of a software-intensive system. As the 36 standard modeling language, the UML facilitates communication and reduces confusion among project 37 . The recent standardization of UML 2.0 has further extended the language"s scope and viability. Its inherent expressiveness allows users to 38 everything from enterprise information systems and distributed Web-based applications to real-time embedded systems. The UML is not limited to modeling software. In fact, it is expressive enough to model 39 systems, such as workflow in the legal system, the structure and behavior of a patient healthcare system, software engineering in aircraft combat systems, and the design of hardware. To understand the UML, you need to form a conceptual model of the language, and this requires learning three major elements: the UML"s basic building blocks, the rules that dictate how those building blocks may be put together, and some common mechanisms that apply throughout the UML.

单选题存储一幅1024×768的32位图像的文件的人小约为______。

单选题用户程序在目标下使用特权指令将引起的中断属于 (13) 。

单选题电子商务交易必须具备抗抵赖性，目的在于防止 （19） 。

单选题当某程序执行时，利用重定位存储管理方式来访问内存，是将 (22) 相加得到 (23) 来进行访问的。

单选题________不是数据仓库的特点。