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| 直接加热炉 | |||
| 直接供暖器 | |||
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direct heater : 20 phrases in 8 subjects |
| Architecture | 2 |
| Chemistry | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 10 |
| Textile industry | 1 |
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