As the transmission length reaches a certain distance, DC transmission becomes economically attractive over ac.
当输电距离足够长时，直流输电的经济性将优于交流输电。
My next stop took me to the AC-DC thermal voltage and current lab.
我的下一站是参观AC - DC热电压和电流实验室。
My next stop took me to the AC-DC thermal voltage and current lab.
我的下一站是参观AC - DC热电压和电流实验室。
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