只用一种试剂或一种方法,经一步实验就可将O2,H2,CO2和空气四种

只用一种试剂或一种方法,经一步实验就可将O2,H2,CO2和空气四种气体区别开来的是                                                

A.石灰水                               B.带火星的木条      

C.紫色石蕊试剂                         D.燃着的木条

 

答案

D

解析:略

 

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