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备用电源 bèiyòng diànyuán
archit.	attached power
avia.	backup battery
busin.	spare electric source; stand-by electric source
chem.	back-up power
commun., railw.	stand-by power supply (source)
el.	back-up power source; stand-by source; stand-by supply; emergency power unit
el.mach.	standby electric source; standby electric supply; standby power (supply); back-up source emergency power supply; back-up source auxiliary power supply
eng.geol.	stand-by power source
expl.	emergency power source
hydroel.st.	standby source; reserve source (stand-by source)
met.	emergency power; stand-by power supply
mil., air.def.	spare power supply
oil	standby power supply; emergency power supply
proj.manag.	standby power source
space	backup power; reserve power supply
tech.	accessory power supply; alternate power source; auxiliary power; backup power source; prime standby power source; reserve power source; spare power source; stand-by electric power; stand-by electrical power
telecom.	auxiliary power supply; auxiliary supply; stand-by power; standby power
紧急备用电源 bèiyòng diànyuán
tech.	emergency supply

备 用 电源: 42 phrases in 12 subjects

Agriculture	1
Automobiles	2
Aviation	3
Electric machinery	2
Electronics	12
Explosives and Explosive Ordnance Disposal	1
Hydroelectric power stations	4
Information technology	2
Multimedia	1
Nautical	1
Technology	12
United Nations	1