厂用电电压等级选择
Selection of Auxiliary Power Voltage Grade
高一级电压等级选择
selection of higher transmission voltage class
中压配电电压等级
medium voltage level of power distribution network
20kV电压等级
20 kV voltage grade
20 kV distribution voltage
20 kV voltage class
20kV voltage grade
20kV voltage level
20kV voltage class
20 kV voltage level
500kV电压等级变电站
500kV voltage grade substation
kV voltage grade substation