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| 曲轴箱强制通风 | |||
| 压力通风; 强制通风 | |||
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positive ventilation : 17 phrases in 9 subjects |
| Automobiles | 3 |
| Drilling | 1 |
| Electric machinery | 1 |
| Mechanic engineering | 1 |
| Mechanics | 1 |
| Nursing | 3 |
| Plastic surgery | 1 |
| Surgery | 3 |
| Technology | 3 |
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