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| direct-current tube | |||
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| battery tube | |||
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直 流管 : 20 phrases in 11 subjects |
| Air defense | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Electric machinery | 1 |
| Electronics | 3 |
| General | 2 |
| Metallurgy | 1 |
| Shipbuilding | 1 |
| Solar power | 1 |
| Technology | 7 |
| Telecommunications | 1 |
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