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当前学科：国家标准及技术规范基础
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无菌室紫外灭菌灯应定期用浸有乙醇的湿布擦拭，然后将布有（）个细菌的琼脂平皿暴露紫外灯下2min，99％的菌数被杀，否则应更换新灯。
A . A、10—20
B . B、50—100
C . C、200—250
D . D、1000—2000
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