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电子扫 描 器 : 25 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 3 |
| Earth sciences | 1 |
| Electronics | 2 |
| General | 1 |
| Oil / petroleum | 1 |
| Radio | 1 |
| Shipbuilding | 2 |
| Space | 4 |
| Technology | 8 |
| Telecommunications | 1 |
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