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| 电子管试验 | |||
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valve test : 34 phrases in 12 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Electronics | 5 |
| General | 1 |
| Mechanics | 2 |
| Nautical | 1 |
| Navigation | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Shipbuilding | 8 |
| Space | 1 |
| Technology | 11 |
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