题目

 “西电东送”工程中为了减少输电损耗，必须提高输电电压．从西部某水电站向华东某地输送电的功率为106kW，输电电压为103kV，输电线电阻为100Ω．若改用超导材料制作的输电线，则可以减小输电损耗的功率为（   ）                                                                                                                                               　   A． 105kW                 B． 104kW        C．   103kW    D． 102kW                                                                                                                                         答案：A

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