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科学技术信息中心美国
el. Scientific and Technical Information Center
科学技术信息中心
avia. scientific and technical information center
科学技术信息中心以色列
earth.sc. Center for Scientific and Technological Information Israel
科学 技 术信息中心
: 14 phrases in 4 subjects
Earth sciences4
Electronics7
Information technology1
Telecommunications2

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