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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任震宇）1月11日，中国消费者协会公布2023年消费维权年主题为“提振消费信心”。中消协以及全国各级消费者组织将围绕年主题开展六个方面的工作，全面促进消费，着力扩大内需，推动高质
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