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容许值: 44 phrases in 15 subjects |
Architecture | 1 |
Aviation | 1 |
Bridge construction | 6 |
Business | 1 |
Earth sciences | 1 |
Ecology | 2 |
Electronics | 3 |
Food industry | 1 |
Food service and catering | 2 |
Hydroelectric power stations | 1 |
Oil / petroleum | 2 |
Space | 1 |
Technology | 18 |
Telecommunications | 2 |
Water resources | 2 |