Standard specification for in - service test methods for temporary grounding jumper assemblies used on de - energized electric power lines and equipment 断电电源线和设备用临时接地跨接组件的运行中试验方法的标准规范
2.
Entertainment technology - temporary ground - supported overhead structures used to cover the stage areas and support equipment in the production of outdoor entertainment events 娱乐业技术.架空悬挂的扬声器外壳.分类制作和结构试验
