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| 电源频率 | |||
| 供电频率 | |||
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supply frequency : 25 phrases in 7 subjects |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 7 |
| Geophysics | 1 |
| Rail transport | 2 |
| Space | 6 |
| Technology | 7 |
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