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夏天到了，不少人会用蚊香、电热蚊香液驱蚊。可您知道吗？这些驱蚊产品安不安全，其实是有国家标准严格把关的！GB/T 13917.4-2009、GB/T 13917.5-2009、GB/T 13917.6
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引言建筑工地上，危险无处不在，你是否曾想过，万一发生意外，自己和家人将如何应对？建筑行业意外保险究竟能为你提供哪些保障？本文将为你一一解答，助你安心工作，无后顾之忧。一. 意外身故伤残保障建筑行业意外
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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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