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2-Trifluoromethylbenzamide
20 种有机氯农药混标
气相色谱-质谱联用仪用异辛烷中六氯苯溶液标准物质
Swep Solution 1000ug/ml in Acetonitrile
碘普罗胺 标准品
2.4-D ethanolamine salt Solution 100ug/ml in Methanol
Trihalomethanes Solutions
Methyl Benzylidene Camphor
车前草
Clofibric-d4 acid