下列化学用语与所表述的意义不相符的是(  )A  .N2——氮气中氮

下列化学用语与所表述的意义不相符的是(  )
A  .N2——氮气中氮元素的化合价为0     B.  2H——2个氢元素
C.  2H2O——2个水分子                     D.  CuO——氧化铜

答案

B解析:

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