单选题Devices that supply power when the commercial utility power system fails are called which of the following? 当商业公用电源系统失效后，需使用下列哪一类供电设备？（）Apower conditioners电压稳压器Bpower filters电源滤波器Cpower dividers功率分配器
单选题
Devices that supply power when the commercial utility power system fails are called which of the following? 当商业公用电源系统失效后，需使用下列哪一类供电设备？（）
A
power conditioners电压稳压器
B
power filters电源滤波器
C
power dividers功率分配器
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