【多选题】【消耗次数：1】
皮肤可以抵御外来的哪些伤害？（）
①
A 水分流失
②
B 微生物感染
③
C 紫外线
④
D 灰尘和污染
参考答案：
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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>
【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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