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| 电路开关 | |||
| 回路转换器 | |||
| 电路转换器 | |||
| 转接器; 电路开关; 开关 | |||
| circuit changer: 4 phrases in 4 subjects |
| Electric machinery | 1 |
| Hydroelectric power stations | 1 |
| Space | 1 |
| Technology | 1 |
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