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| changeover switch | |||
| pole-changing switch | |||
| pole changing switch | |||
| pole changer; pole reverser | |||
| 换极开关: 7 phrases in 5 subjects |
| Automated equipment | 1 |
| Automobiles | 2 |
| Electric machinery | 1 |
| Electronics | 1 |
| Technology | 2 |
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