?直流电网
... direct-current mains 直流电力网 direct-current mains 直流电网 direct-current measuring transductor 直流测量用饱和电抗器 ...
直流电源
Their job is to convert high-voltage alternating current from the mains into low-voltage direct current for mobile phones, laptops, iPods and other electronic gadgets.
ECONOMIST: How a boring gadget saved $2 billion-worth of electricity
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