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| 谐波电流 | |||
| 正弦电流 | |||
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harmonic current : 20 phrases in 9 subjects |
| Air defense | 2 |
| Electric machinery | 2 |
| Electronics | 3 |
| Hydroelectric power stations | 1 |
| Information technology | 2 |
| Metallurgy | 1 |
| Rail transport | 1 |
| Space | 1 |
| Technology | 7 |
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