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| 金属电子管 | |||
| 金属管 (pipe) | |||
| 金属管 | |||
| 金属壳电子管 | |||
| metal tube: 25 phrases in 10 subjects |
| Automobiles | 1 |
| Chemistry | 2 |
| Electronics | 4 |
| General | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 2 |
| Polygraphy | 1 |
| Solar power | 1 |
| Technology | 9 |
| Telecommunications | 2 |
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