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分区系统
refrig.
zoning system
tech.
zone system
分区 系统:
51 phrases
in 17 subjects
Air defense
1
Architecture
1
Artificial intelligence
1
Construction
1
Desert science
1
Earth sciences
10
Electronics
6
Environment
1
Hydroelectric power stations
1
Metallurgy
1
Multimedia
1
Nuclear and fusion power
1
Oil / petroleum
2
Radio
1
Technology
19
Telecommunications
2
United Nations
1
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