如图所示把锌片和铜片用导线相连后插入稀硫酸构成原电池.下列叙述正确的是 A.一段时间后溶液变蓝b.cu是负极cu被氧化c.电子从锌片经 Template




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tomski如图所示把锌片和铜片用导线相连后插入稀硫酸构成原电池.下列叙述正确的是 a.一段时间后溶液变蓝b.cu是负极cu被氧化c.电子从锌片经 coloring