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| 电压特性曲线 | |||
| 电压曲线 | |||
| voltage curve: 40 phrases in 7 subjects |
| Air defense | 1 |
| Electric machinery | 10 |
| Electronics | 17 |
| General | 2 |
| Geophysics | 1 |
| Metallurgy | 1 |
| Technology | 8 |
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