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基本号 : 28 phrases in 13 subjects |
| Air defense | 1 |
| Automobiles | 3 |
| Aviation | 3 |
| Bridge construction | 1 |
| Chemistry | 2 |
| Computers | 1 |
| Electronics | 1 |
| General | 2 |
| Geophysics | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
| Telecommunications | 4 |
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