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冷子管 : 29 phrases in 10 subjects |
| Astronautics | 1 |
| Automobiles | 1 |
| Computers | 1 |
| Electronics | 7 |
| General | 2 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Radio | 1 |
| Shipbuilding | 1 |
| Technology | 11 |
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