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| 双线圈 | |||
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two coil : 19 phrases in 8 subjects |
| Business | 1 |
| Electric machinery | 4 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 8 |
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