空气降落实验用于检查包装车间卫生条件,其方法是将9Cm培养皿倾入10ml无菌培养基地待凝固后,置于包装车间内暴露15分钟要求细菌总数小于()个菌落。
参考答案:30
Eggs, meat, vegetables and other foods can easily be poisoned by microorganisms such as ______.
A.phenomena
B.dilemma
C.diploma
D.bacteria