【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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【单选题】
使用紫外线灯消毒时紫外线强度不低于（）
①
50μW/cm<sup>2</sup>
②
60μW/cm<sup>2</sup>
③
70μW/cm<sup>2</sup>
④
80μW/cm<sup>2</sup>