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为了解舞厅的空气卫生状况，掌握不同时间空气中细菌的数量、种类、分布及污染程度，我们于１９９９年４月对我区舞厅空气进行了卫生细菌的调查。１． 材料和方法１．１ 材料 普通营养培养基（北京市海淀区微生物培养基制品厂提供）生化微量培养管（上海市医学化验所试剂厂
In order to understand the sanitation status of the ballroom and to know the amount, types, distribution and degree of contamination of the bacteria in the air at different times, we conducted a survey on sanitation bacteria in the ballroom air in our district in April 1999. 1. Materials and methods 1.1 Materials Ordinary nutrition medium (provided by Beijing Haidian Microbial Culture Products Factory) Biochemical micro culture tube (Shanghai Medical Laboratory Reagent Factory