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| 输送管网 | |||
| 流动回路 | |||
| 水流回路; 输油管网 | |||
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flow circuit : 9 phrases in 7 subjects |
| Air defense | 1 |
| China | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Space | 2 |
| Technology | 2 |
| Wind Energy | 1 |
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