在化学分析与环境监测的广阔领域里，精准的pH值测量是基础中的基础。多年的实验室工作经验告诉我，一个微小的pH偏差，都可能对实验结果产生重大影响。而氢氧化钙pH溶液标准物质，正是那把确保我们测量准确无误

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中国消费者报报道记者裴莹）双11前夕，北京市第四中级人民法院公布一起电商虚假宣传官司终审判决，“坚果”投影机厂家因虚标参数被判构成欺诈。投影机近年来在社交平台频频被&ldquo

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