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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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中国消费者报深圳讯记者黄劼）部分培训机构存在售前虚假宣传承诺、诱导贷款支付培训费问题，以及部分学习机、阅读器和早教机的在线课程服务存有风险，这是今年上半年深圳消费者投诉出现的热点。深圳市消委会近日发布

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