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| 换接管; 电子管转换开关; 转换管 | |||
| 开关管 | |||
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| 电子管转换开关 | |||
| 开关管 | |||
| 开关电子管 | |||
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| 开关管; 电子管转换开关 | |||
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switching tube : 26 phrases in 7 subjects |
| Air defense | 1 |
| Computers | 1 |
| Electronics | 3 |
| Geophysics | 1 |
| Radio | 4 |
| Space | 1 |
| Technology | 15 |
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