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| 煤气总管 | |||
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| 总气管 | |||
| 飞艇上通往各气囊的主充气管 | |||
| 地下煤气管道 | |||
| 煤气总管 | |||
| 气体煤气总管 | |||
| 配气干线; 气体总管; 输气干线 | |||
| 燃气输送管线; 输气管线煤气总管; 煤气干管 | |||
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gas-main : 23 phrases in 6 subjects |
| Chemistry | 1 |
| Metallurgy | 10 |
| Oil / petroleum | 3 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
| Technology | 7 |
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