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| 继电器磁力开关; 控制继电器 | |||
| 延时开关; 继电器开关 | |||
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| 转播/转换 | |||
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relay switch : 7 phrases in 5 subjects |
| Automobiles | 2 |
| Aviation | 1 |
| Electronics | 2 |
| Shipbuilding | 1 |
| Technology | 1 |
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