北京严格加强快递外卖疫情防控工作

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中国消费者报报道记者徐文智）2017年6月13日，一行20多人的队伍背着大小包裹，乘坐大巴车，风尘仆仆地来到渭北高原一座小城郊外。伫立在崭新的5层楼宇前，望着建筑垃圾遍地的空荡荡的大楼，当时只有28岁

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在化学分析与实验室研究的广阔天地里，每一种试剂都扮演着不可或缺的角色，而甲醇标准品更是其中的佼佼者。基于多年的行业经验，我深知实验室对基准试剂的严苛要求——不仅要纯度高、稳定性

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