A.45min
B.30min
C.60min
D.90min
E.15min
[单选题]室内空气采样前应关闭门窗12小时,至少采样( )。A.45minB.30minC.60minD.90minE.15min
[单选题]室内空气采样前应关闭门窗12小时,至少采样( )。A.45minB.30minC.60minD.90minE.15min
[单选题]室内空气采样前应关闭门窗12小时,至少采样( )。A.45minB.30minC.60minD.90minE.15min
[单选题]室内空气质量标准规定,对面积为105m2居室室内空气采样时,至少应设采样点数为( )。A.6个B.4个C.3个D.5个E.2个
[单选题]室内空气质量标准规定,对面积为105m2居室室内空气采样时,至少应设采样点数为( )。A.6个B.4个C.3个D.5个E.2个
[单选题]室内空气质量标准规定,对面积为105m2居室室内空气采样时,至少应设采样点数为( )。A.6个B.4个C.3个D.5个E.2个
[单选题]室内空气质量标准规定,对面积为105m2居室室内空气采样时,至少应设采样点数为( )。A.6个B.4个C.3个D.5个E.2个
[多选题] 室内空气中氡测量时,采样点应布置在()A .底层房间B .加热室C .客厅D .厕所
[单选题]室内空气TVOC采样时应在采样地点打开吸附管,与空气采样器入口()连接。A . 平行B . 垂直C . 交叉D . 无所谓
[多选题] 现场室内空气中采样应记录采样有关的()。A .温度B .湿度C .采样时间D .大气压