HTML 中标记用于定义表格的 （ ） 。
A、行
B、列
C、单元格
D、标题
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一个 B 类网络的子网掩码为 255.255.224.0，则这个网络被划分成了（ ）个子网。
A、2
B、4
C、6
D、8
在 Windows 系统中设置默认路由的作用是 （ ） 。
A、当主机接收到一个访问请求时首先选择的路由
B、当没有其它路由可选时最后选择的路由
C、访问本地主机的路由
D、必须选择的路由
HTML<body>元素中，（ ）属性用于定义超链接被鼠标点击后所显示的颜色。
A、alink
B、background
C、bgcolor
D、vlink
以下不符合 XML 文档语法规范的是 （ ） 。
A、文档的第一行必须是 XML 文档声明
B、文档必须包含根元素
C、每个开始标记必须和结束标记配对使用
D、标记之间可以交叉嵌套
For nearly ten years, the Unified Modeling Language (UML) has been the industrystandard for visualizing, specifying, constructing, and documenting the（1） of a software-intensive system. As the （2）standard modeling language, the UML facilitates communication and reduces confusion among project （3） The recent standardization of UML 2.0 has further extended the language's scope and viability. Its inherent expressiveness allows users to （4） 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 （5） systems, such as workflow in the legal system, the structure and behavior of a patien 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.
（1）A、classes
B、components
C、sequences
D、artifacts
（2）A、real
B、legal
C、de facto
D、illegal
（3）A、investors
B、developers
C、designers
D、stakeholders
（4）A、model
B、code
C、test
D、modify
（5）A、non-hardware
B、non-software
C、hardware
D、software
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