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在化学分析与材料研究的广阔天地里，标准物质如同标尺，衡量着每一次实验的精准与可靠。特别是在聚合物科学、材料表征及环境监测等领域，甲醇中苯乙烯溶液标准物质以其独特的价值，成为众多实验室不可或缺的&ldq
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中国消费者报北京讯记者孟刚）3月27日，国家卫生健康委、市场监管总局联合印发2025年第2号公告，发布50项新食品安全国家标准和9项修改单。其中提出，不允许再使用“不添加”“零添加”等用语。新发布标准