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【单选题】
紫外线分为UV-A 、UV-B、 UV-C三种,用于荧光磁粉检测的是:
A.
UV-A；
B.
UV-B；
C.
UV-C；
D.
以上都是。
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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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