采用甘油冷冻保存鸡大肠埃希氏菌病灭活疫苗生产用菌种的试验
채용감유냉동보존계대장애희씨균병멸활역묘생산용균충적시험
A trial on preserving the seed bacterium by freeze with glycerine for producing the inactivated avian Escherichia coli vaccine
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