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【单选题】
专间内安装紫外线灯作为空气消毒装置的，紫外线等应分布均匀，距离地面()。
A.
2.1米
B.
2.5米
C.
3米
D.
1.8米
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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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