食物链微生物学梭状芽孢杆菌检测和计数的水平方法第1部分:用菌落计数技术计数减少亚硫酸盐的梭状芽孢菌Microbiology of the food chain - Horizontal method for the detection and enumeration of Clostridium spp - Part 1: Enumeration of sulfite-reducing Clostridium spp by colony-count technique