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| 电机的集电环 | |||
| 集电环 | |||
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| 集电环 | |||
| bus rings: 20 phrases in 6 subjects |
| Aviation | 1 |
| Computer networks | 1 |
| Electronics | 11 |
| Hydroelectric power stations | 3 |
| Technology | 3 |
| Telecommunications | 1 |
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