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分支系统
tech.
branch system
;
extensive system
分支系统
:
35 phrases
in 15 subjects
Air defense
2
Automobiles
1
Aviation
2
Chemistry
1
Desert science
1
Drilling
1
Earth sciences
3
Electronics
2
Geology
2
Hydroelectric power stations
1
Information technology
5
Metallurgy
2
Navigation
3
Space
1
Technology
8
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