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【单选题】
用紫外线消毒病室, 错误 的做法是A.
卧床患者需戴防护镜
B.
灯管表面的灰尘需要擦净
C.
灯管使用满1000小时则应更换
D.
灯亮5-7分钟开始计算消毒时间
E.
紫外线消毒的适宜温度是18-22℃
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举一反三
【单选题】听力原文： Many scientists had very bad proficiency records in their school days. Famous inventor Thomas Edison, for instance, did so poorly in his first years of school that his teacher warned his parents...
A.
They were top students.
B.
They went to best public schools.
C.
They were not very good students.
D.
Their teachers thought they would be very successful.
【简答题】在分析单元操作或化工过程时,常用到 ( ) 、 ( ) 、平衡关系和过程速率四个基本概念。