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存取 装 置 : 39 phrases in 10 subjects |
| Aviation | 8 |
| Computers | 3 |
| Earth sciences | 2 |
| General | 3 |
| Geophysics | 1 |
| Information technology | 4 |
| Mechanic engineering | 1 |
| Space | 6 |
| Technology | 5 |
| Telecommunications | 6 |
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