15.a 解析 化学反应的前后原子的个数没有变化分子的中类一定�生变化氧化汞是由氧原子和汞原子构成的化合物汞是由汞原子构成的单质氧气是 Template




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tomski15.a 解析 化学反应的前后原子的个数没有变化分子的中类一定�生变化氧化汞是由氧原子和汞原子构成的化合物汞是由汞原子构成的单质氧气是 coloring