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return system
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返回系统
tech.
回复系统
;
回风系统
return system
:
103 phrases
in 25 subjects
Air defense
1
Architecture
2
Automobiles
1
Aviation
1
Business
3
Chemistry
1
Construction
1
Earth sciences
1
Ecology
3
Electric machinery
2
Electricity
5
Electronics
4
General
1
Hydroelectric power stations
4
Mathematics
3
Metallurgy
4
Name of organization
1
Nautical
1
Oil / petroleum
3
Rail transport
2
Refrigeration
6
Space
4
Technology
46
Telecommunications
2
Water resources
1
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