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| 电子管振荡器 | |||
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tube generator : 24 phrases in 8 subjects |
| Air defense | 1 |
| Chemistry | 1 |
| Electronics | 6 |
| Mechanics | 1 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Technology | 9 |
| Water resources | 1 |
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