【单选题】
某施工过程的基本工作时间为30min,辅助工作时间为5min,准备与结束工作时间为10min,不可避免的中断时间为5min,必要的休息时间为5min,则定额时间为()min。
【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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