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科学信息中心
美
earth.sc.
Scientific Information Center
科学信息中心
avia.
science information center
美国
科学信息中心
telecom.
Scientific Information Center
科学 信息中心
:
34 phrases
in 6 subjects
Aviation
2
Earth sciences
12
Electronics
13
Information technology
1
Space
3
Telecommunications
3
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