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| 真空二极整流管 | |||
| 高压整流二极管; 二极整流管 | |||
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| 高压整流管; 大型热阴极二极管 | |||
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kenotron : 4 phrases in 3 subjects |
| Electric machinery | 1 |
| Metallurgy | 2 |
| Shipbuilding | 1 |
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