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| 后弯曲叶片 | |||
| 后弯叶片 | |||
| 反曲叶片 | |||
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| 后弯曲叶片 | |||
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backward -curved blade : 4 phrases in 4 subjects |
| Ecology | 1 |
| Metallurgy | 1 |
| Refrigeration | 1 |
| Technology | 1 |
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