详细的网上购物系统设计，包括时序图，类图，构件图等，非常具有指导意义。-Detailed design of the online shopping system, including the timing diagram, class diagram, component diagram and so on, are very instructive.

The chip tester verifies the functionality and timing of a variety of 7400 series integrated circuits. Students taking Digital Logic Design Lab, Use these chips often in their laboratory. The IC to be tested should be placed on the ZIF socket and t

网上书店uml 用例图，协作图 时序图 时序图-Online bookstore uml use case diagram, collaboration diagram timing diagram timing diagram

设计一个加法速度测试程序，程序启动后显示出如图所示的运行界面。用户单击“开始”按钮后开始计时，并分别在文本框1、2中随机生成并显示加数和被加数，用户在文本框3中输入答案，按回车键后程序在答案的后面指示对错，并显示出下一道题。一分钟以后程序统计出出题数量和作对的数量。用户单击“结束”按钮退出程序。(An addition speed test program is designed. After the program is started, the running interface is sh