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GB 4789.42-2025_Chinese: National food safety standard - Food microbiological examination - Examination of Norwalk Viruses (Chinese: 食品安全国家标准 食品微生物学检验 诺如病毒检验) Note/Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working-hours typically, ASAP English versions: GB 4789.42-2025
