单项选择题
Models drawn by the system analysts during the process of the structured analysis are（）
A．PERTs B．ERDs C．UMLs D．DFDs
单项选择题 在Windows操作环境中，采用（）命令宋查看本机IP地址及网卡MAC地址。
单项选择题 （）is a clickable string or graphic that points to another Web page or document.
单项选择题 C++ is used with proper（）design techniques.
