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| return circuit system | |||
| drainback system | |||
| return flow system; reverse flow system | |||
| return-flow system; regeneration system | |||
| 回流系统: 20 phrases in 7 subjects |
| Aviation | 1 |
| Ecology | 1 |
| Electronics | 4 |
| Metallurgy | 2 |
| Mining | 1 |
| Refrigeration | 3 |
| Technology | 8 |
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