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PCB No. 39,10ng/ul 标准品
5-Methyl-2,2',4,5'-tetrachlorodiphenylmethane
DL-2-Aminobutyric acid
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甲磺酸达氟沙星纯度标准物质 农科院质标所
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5-Nitroindole (无证书)
GB19648(GB23200.8)农药 BePure-30839-4LA
Benzyl chloride Solution 100ug/ml in Toluene
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