厂用电备用电源
plant standby power supply
水泵用电动机的选用
Selection of the Proper Motor for Pumps
电驱动+电动缸的控制系统
Control System of Driving with Motor and Jar
备用电池
reserve battery
battery
basic direct access method
spare battery
stand-by battery
stand-by power battery
备用电力变压器
auxiliary power transformer