在H2,H2O,H2SO4,NaOH四种物质中,都含有(    )     A.氢元素   

H2H2OH2SO4NaOH四种物质中,都含有(    )

    A.氢元素         B.两个氢原子       C. 两个氢元素    D.一个氢分子

答案

A

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