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脉冲成形 电路 : 16 phrases in 9 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Electronics | 2 |
| General | 1 |
| Nuclear physics | 2 |
| Oil / petroleum | 1 |
| Radio | 2 |
| Space | 2 |
| Technology | 4 |
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