【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】
餐前便后、外出回家、接触垃圾、抚摸动物后要洗手，洗手时要注意用流动的水和使用肥皂（皂液），揉搓的时间不少于15秒，揉搓步骤七字口诀是
①
内-外-夹-弓-大-弯-腕
②
内-外-上-下-大-立-腕
③
内-外-夹-弓-大-立-腕
④
内-外-左-右-大-立-腕