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| 总抽风管; 吸风总管; 大烟道; 抽风总管 | |||
| 吸水总管; 吸水干管; 吸入总管; 吸人干管 | |||
| suction main: 5 phrases in 3 subjects |
| Compressors | 1 |
| Metallurgy | 2 |
| Technology | 2 |
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