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2,3,3',4-Tetrachlorobiphenyl (无证书)
N,N-Dimethylformamide
氯替泼诺,100ppm
Dapsone
石油醚中P.P-DDT溶液标准物质
1,1,1,3,9,11,11,11-Octachloroundecane
4'-Fluoro-2,3',6-tribromodiphenyl ether
2-Amino-5-methyl-3-thiophenecarbonitrile
4-差向脱水四环素
N-Nitrosodimethylamine Solution 100ug/ml in Methanol