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working drawing |
实施 设计 : 15 phrases in 10 subjects |
Bridge construction | 1 |
Economy | 1 |
Electronics | 3 |
Explosives and Explosive Ordnance Disposal | 2 |
Hydroelectric power stations | 1 |
Plastics | 1 |
Rail transport | 2 |
Space | 1 |
Technology | 2 |
United Nations | 1 |