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开和关
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开和关
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62 phrases
in 19 subjects
Air defense
1
Automobiles
6
Aviation
3
China
3
Ecology
1
Economy
2
Electric machinery
1
Electronics
7
Explosives and Explosive Ordnance Disposal
2
General
1
Hydroelectric power stations
9
Metallurgy
1
Name of organization
3
Nautical
2
Project management
1
Shipbuilding
4
Space
2
Technology
6
United Nations
7
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