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| 功率电子管; 功率放大管 | |||
| 功率管; 强放管 | |||
| 功率电子管; 动力管道 | |||
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power tube : 30 phrases in 6 subjects |
| Air defense | 4 |
| Electronics | 2 |
| General | 2 |
| Metallurgy | 2 |
| Space | 2 |
| Technology | 18 |
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