设计、开发、改造、安装、测试和维护用于计算机系统、通信系统、娱乐、运输和其他工业应用的电子元件、电路和系统。可能需要注册或许可。Designs, develops, adapts, installs, tests and maintains electronic components, circuits and systems used for computer systems, communication systems, entertainment, transport and other industrial applications. Registration or licensing may be required.