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| 谐振继电器 | |||
| 频率〔谐振〕继电器 | |||
| 频率继电器 | |||
| frequency relay: 31 phrases in 10 subjects |
| Air defense | 1 |
| Electric machinery | 1 |
| Electronics | 11 |
| General | 1 |
| Geophysics | 1 |
| Hydroelectric power stations | 2 |
| Information technology | 1 |
| Metallurgy | 1 |
| Space | 2 |
| Technology | 10 |
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