中国消费者报报道记者薛庆元）一注2元的彩票，可能中奖500万元，虽然中大奖的概率寥寥，但还是吸引了许多人跃跃欲试。然而最近，江苏南京一些学生家长向《中国消费者报》记者反映，在南京市部分地铁站、商超等闹
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在化学研究的广阔天地里，每一种标准物质的选用都关乎实验结果的准确性和可靠性。多年从事化学分析与研究的经历，让我深刻体会到，乙醇中硝基苯溶液标准物质作为一类重要的化学参考物质，其重要性不言而喻。它不仅在
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