如图所示,两电极一为碳棒,一为铁片,若电流表的指针发生偏转

 如图所示,两电极一为碳棒,一为铁片,若电流表的指针发生偏转,且a极上有大量气泡生成,则以下叙述正确的是                                                

a

 
Aa为负极,是铁片,烧杯中的溶液为硫酸                             G

b

 
Bb为负极,是铁片,烧杯中的溶液为硫酸铜溶液

Ca为正极,是碳棒,烧杯中的溶液为硫酸

Db为正极,是碳棒,烧杯中的溶液为硫酸铜溶液

答案

C

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