back up power 后备电源 ; 备份电源 ; 备用电源 ; 备份权力
back-up power supply 备用电源
back-up power system 后备电源
memory back-up power source 备用记忆电源
Doubled Back-up Power Supply 双备份供电
automatic back-up power supply device 备用电源自投装置
power-driven back-up roller 动力驱动防弯压辊
Power back up system 备用电源系统
Widely used in battery back up power systems and solar systems.
广泛使用的电池备份的电力系统和太阳能系统。
The electrification of Europe and America in the late 19th century sparked the use of storage batteries for telegraphy, portable electric-lighting systems and back-up power.
在19世纪晚期，欧洲和美国的电气化进程开始将蓄电池大规模用于电信技术、便携式电灯系统和后备电源。
Homes lacked back-up power generators.
家里也没有备用的发电机。
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