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存取码 : 29 phrases in 11 subjects |
| Architecture | 1 |
| Automobiles | 2 |
| Aviation | 1 |
| Business | 1 |
| Earth sciences | 1 |
| Electronics | 1 |
| Geophysics | 1 |
| Information technology | 1 |
| Space | 4 |
| Technology | 11 |
| Telecommunications | 5 |
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