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| 双环的; 双回线〔回路〕的 | |||
| 双回路的; 双闭环 | |||
| two -loop: 11 phrases in 6 subjects |
| Electronics | 1 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 4 |
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