化学反应前后下列各项中肯定不�生变化的是 �原子的数目 �分子的数目 �元素的种类 �物质的总质量 �物质的种类�原子的种类 �原子的质量 Template




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tomski化学反应前后下列各项中肯定不�生变化的是 �原子的数目 �分子的数目 coloring