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归零制信号
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:
197 phrases
in 21 subjects
Agriculture
1
Air defense
2
Automobiles
3
Aviation
7
Chemistry
1
Commerce
1
Communications
1
Computers
6
Construction
1
Earth sciences
7
Economics
1
Electronics
35
General
6
Geophysics
7
Information technology
28
Mathematics
3
Metallurgy
1
Oil / petroleum
6
Space
14
Technology
40
Telecommunications
26
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