Cisco图标，vss格式。写方案文档时，可以参考借用一下。-Cisco icon, vss format. Writing the program document, you can refer to borrowing.

安防系统cad图标，监控系统，报警系统，门禁系统-Security systems cad icon, monitoring systems, alarm systems, access control systems

使用QT写计算器时的代码文档，详细的介绍了该项目的规划和具体功能的逻辑实现，并有相应的图示进行说明。-When using QT write a calculator code documentation, detailed introduces the project planning and implementation of the specific function logic, and a corresponding icon.