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| 压模锻的自然斜度 | |||
| 自然斜度 | |||
| 自然抽风; 自然换气 | |||
| 自然通风 | |||
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natural draft : 27 phrases in 7 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Electric machinery | 4 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 14 |
| Wind Energy | 3 |
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