技术安装

工业电气安装作业，安装控制面板和电线 electrician checking solar panel
man working on control panel
HVAC服务 air conditioner fixing hvac
焊接服务 TIG welder welds elbow to polished stainless steel pipe
专业技术人员正在进行工业管道安装作业worker at a water supply station inspects water pump valves