如右图所示把锌片和铜片用导线相连后插入稀硫酸溶液构成原电池下列叙述正确的是 A.zn是负极�生还原反应 B.电流从锌片经外电路流�铜片 Template




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tomski如右图所示把锌片和铜片用导线相连后插入稀硫酸溶液构成原电池下列叙述正确的是 a.zn是负极�生还原反应 b.电流从锌片经外电路流�铜片 coloring