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| 电子管电压表; 场效应管式电压表 | |||
| 电子伏特计; 电子式电压表; 电子管伏特计 | |||
| 电子电压表 | |||
| 电子管伏特计 | |||
| electronic voltmeter: 4 phrases in 3 subjects |
| Electronics | 1 |
| General | 1 |
| Geophysics | 2 |
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