在5支编号的试管里分别装有K2CO3、KNO3、K2SO4、KOH和Ba(OH)2溶液,现需

在5支编号的试管里分别装有K2CO3、KNO3、K2SO4、KOH和Ba(OH)2溶液,现需要用最少种类的试剂将它们一一区别开来,则所需试剂的种类是(    )

A.用1种试剂                                B.用2种试剂

C.用3种试剂                                D.不用任何试剂

答案

A

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