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《民用建筑工程室内环境污染控制规范》规定，在民用建筑工程室内进行氡浓度检验时，对采用自然通风的民用建筑工程，房间的对外门窗关闭（ ）h以后进行。
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举一反三
【简答题】As children enter adolescents, they begin to do the following except ______.
【简答题】无线局域网可分为哪两类?
【单选题】听力原文： Honduran authorities dedicated to the protection of children and adolescents have undertaken a campaign to protect youngsters who beg on the streets. In the capital of Tegucigalpa alone, the eff...
A.
the police.
B.
the district attorney.
C.
the prison authorities.
D.
Institute of Childhood and Family.
【单选题】What is mentioned by the passage as a way for the adolescents to attract attention to themselves?
A.
To commit serious crimes.
B.
To work hard.
C.
To get ill and go to hospital.
D.
To engage in competition.
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