也有提供备用灯。
当一根灯损坏后，自动切换到备用灯管，使灯器正常发光。
After one lamp is damaged, switch over managing to the reserve lamp automatically to make the lamp machine give out light normally.
备用控制面板。它的按钮、显示灯和操作杆都更少，但同样能够进行主要的操作。
The reserve control panel. It has fewer buttons, lights and levers, but it is still able to make the main operations.
以往经常用自备柴油发电机组、蓄电池、干电池和镍镉电池应急灯作为应急备用电源。
Traditionally, diesel oil-based generators, storage battery, dry battery and emergency lighting equipped Ni-Cd battery are always used as standby emergency power supply.
它发出的光足以作为主灯使用，而且他非常小巧也可以作为备用。
It is bright enough to be used as a primary light, and compact enough to be used as a backup.
碳电极、碳刷、灯碳棒、电池碳棒及电气设备用的其他石墨或碳精制品，不论是否带金属。
Carbon electrodes, carbon brushes, lamp carbons, battery carbons and other articles of graphite or other carbon, with or without metal, of a kind used for electrical purposes.
碳电极、碳刷、灯碳棒、电池碳棒及电气设备用的其他石墨或碳精制品，不论是否带金属。
Carbon electrodes, carbon brushes, lamp carbons, battery carbons and other articles of graphite or other carbon, with or without metal, of a kind used for electrical purposes.
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