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【单选题】
某手术室长6米，宽5米，高3米，安装有循环风紫外线空气消毒器，所用循环风量必须（）。
A.
<180m3/h
B.
<360m3/h
C.
>180m3/h
D.
>360m3/h
E.
>720m3/h
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away
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【单选题】Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, ...
A.
from
B.
than
C.
as
D.
away
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