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存取体 : 27 phrases in 10 subjects |
| Aviation | 2 |
| Computer networks | 1 |
| Computers | 2 |
| Earth sciences | 1 |
| Electronics | 8 |
| General | 1 |
| Project management | 1 |
| Space | 3 |
| Technology | 6 |
| Telecommunications | 2 |
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