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【单选题】
日晒伤是皮肤接受了超过耐受量的哪种波长紫外线而引起的急性皮肤炎症：（）
A.
长波紫外线
B.
中波紫外线
C.
短波紫外线
D.
红外线
E.
可见光
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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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