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【单选题】
档案库、档案阅览、展览厅及其他技术用房的人工照明应选用紫外线含量低的光源。当紫外线含最超过（）时，应采取防紫外线的措施。
A.
50uW/m
B.
60uW/lm
C.
75uW/Im
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参考答案：
举一反三
【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
相关题目：
【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
参考解析：
题目纠错 0
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