题目内容

12.紫外线灯最佳的杀菌波长是多少？

A. 240～250nm
B. 250～270nm
C. 270～280nm
D. 260～280nm

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日光暴晒法达到消毒目的需要用的时间是

A. 2小时
B. 4小时
C. 6小时
D. 8小时
E. 10小时

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