某室内发生呼吸道传染病时,可以采用次氯酸钠消毒液对空气进行气溶胶喷雾消毒()
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实践证明练微复制这种再生性的保护措施用于古籍保护非常可行,它的显著优点是()
脊髓灰质炎病毒是以粪口途径和口口途径的传播为主()
The first step in the study of any language is observing and ____ precisely what happens when native speakers speak it.
A. setting off
B. setting about
C. setting up
D. setting down
艾滋病自愿咨询检测中出现HIV抗体检测结果不确定时,应告诉求询者三个月以后复查()