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振幅脉冲 : 46 phrases in 11 subjects |
| Air defense | 5 |
| Automobiles | 1 |
| Aviation | 2 |
| Earth sciences | 7 |
| Electronics | 2 |
| General | 2 |
| Geophysics | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Radio | 1 |
| Technology | 20 |
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