19.如图所示下列说法不正确的是 A.铜片上�生的反应为2h 2e =h2� b.h 所得电子来自于�属铜 c.导线中电流的方�是 Template




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tomski19.如图所示下列说法不正确的是 a.铜片上�生的反应为2h 2e coloring