青霉素G钾盐,Penicillin G potassium salt;Pharmaceutical Secondary Standard; Certified Reference Material
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金/银清洗剂,Gold/Silver cleaner
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脂多糖来源于大肠杆菌K-235;Lipopolysaccharides from Escherichia coli K-235 [LPS];purified by gel-filtration chromatography