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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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中国消费者报北京讯记者王小月）9月7日，国家邮政局发布今年8月中国快递发展指数。经测算，8月中国快递发展指数为361.5，同比提升16.2%，其中发展规模指数、服务质量指数、发展能力指数和发展趋势指数

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