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?????2021-06-16 ????? ?????????????????????


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???????????????????????????????????????????б??????з???????????????????????????????A Chemtek ????й???????飬?????CNAS/ISO9001???????????First Standard ? ?л????????з????????????????????????????????????????????????1600????????600?????????????????????????????????????????????????????????飬??????? 

????Alta Scientific Co. Ltd., a leading analytical standards company in Tianjin, China, focus on organic reference standards. First Standard? products include 1600 pesticides, 600 veterinary medicines, food additives and biotoxins in form of neat, single or mixed standard solutions. Based on reliable service, Alta has been established in-depth collaborations with many top-level institutions. 

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