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• 标准物质网是国内最大的标准物质贸易平台。产品涵盖农药标准物质，土壤标准物质，兽药标准物质，冶金标准物质，国家药典标准物质及化学试剂。收录全部国家一级标准物质和二级标准物质。电话：010-52673060/61/62

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