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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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聚焦绿色、智能、适老！家装厨卫“焕新”补贴标准明确2025-02-11来源：新华社关键词：家装热度：5668商务部等6部门近日印发关于做好2025年家装厨卫“焕新”工作的通知，1月27日对外发布。商务

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在化学研究与实验领域，我们深知每一个细节都至关重要。多年来，我见证了无数实验因微小的试剂差异而走向截然不同的结果。一、实验中的变色魔法师1、酸碱指示的得力助手想象一下，当你需要精确调整溶液的pH值时，