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| artificial commutation | |||
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| manual operation | |||
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人 工 交换 : 26 phrases in 8 subjects |
| Aviation | 1 |
| Electronics | 5 |
| General | 1 |
| Information technology | 3 |
| Metallurgy | 1 |
| Space | 1 |
| Technology | 10 |
| Telecommunications | 4 |
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