中国消费者报报道记者张恒）“家中突然断电了，国家电网大连中山区供电公司的维修工人检查后告诉我，我们家户内电路完好，断电原因可能是从电表进入家中这段电缆出现了问题。按照电表前归电力公司、电表

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随着我国对环境空气污染物监测要求的不断提高，多氯联苯PCBs）作为持久性有机污染物POPs）的重要成员，其准确测定对环境保护和公共健康至关重要。为满足HJ 902-2017《环境空气 多氯联苯的测定

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