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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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中国消费者报报道记者李洪涛）3月7日，《中国消费者报》记者站接到吉林省辽源市消费者朱女士的投诉，反映其母亲孙女士在参加一医疗器械经销公司开展的“可喜安”温热电位治疗仪体验式营销活动时，遭遇商家忽悠，花

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