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| 加热主管; 供暖总管 | |||
| 供暖干管; 暖气总管 | |||
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heating main : 9 phrases in 6 subjects |
| Aviation | 2 |
| Electronics | 2 |
| Exhibitions | 1 |
| Plastics | 1 |
| Refrigeration | 1 |
| Technology | 2 |
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