与设备类似，具体的映像堆栈集中控制和测试。
Like an appliance, the specific image stack is controlled and tested together.
此单元组的电工铺陈，组装，安装，测试，故障排除和修复建筑物和其他结构内的电线，灯具，控制设备及相关设备。
Electricians in this unit group lay out, assemble, install, test, troubleshoot and repair electrical wiring, fixtures, control devices and related equipment in buildings and other structures.
检查分配的机车并测试运行的控制器和设备。
Inspect assigned locomotives and test operating controls and equipment.
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