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| 双绕线圈 | |||
| 双线圈 | |||
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double coil : 16 phrases in 7 subjects |
| Air defense | 1 |
| Automobiles | 2 |
| Electric machinery | 3 |
| Electronics | 1 |
| Metallurgy | 4 |
| Refrigeration | 1 |
| Technology | 4 |
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