用右图所示装置电解水,反应一段时间后,对有关现象和结论描述正

用右图所示装置电解水,反应一段时间后,对有关现象和结论描述正确的是      

  A.甲试管中收集到的气体能支持燃烧

B.甲、乙两试管中收集到的气体质量比为21  

C.甲、乙两试管中收集到的气体体积比为2

 D.水是由氢气、氧气组成的

答案

C

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