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| 电器触点接触器故障 | |||
| 触点损坏 | |||
| 接触不良缺陷 | |||
| 接触故障; 接触不良 | |||
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contact fault : 4 phrases in 3 subjects |
| Power system protection | 2 |
| Rail transport | 1 |
| Telecommunications | 1 |
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