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中国消费者报报道记者刘传江）手机卡常年不怎么使用，数据流量也是关闭状态，可手机却不断产生数量不等的流量：有时一个月出现44条上网记录，最少的一次产生0.05KB的上网流量被收取0.01元。手机自带的流

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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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