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头 阀 : 54 phrases in 11 subjects |
| Automobiles | 3 |
| Chemistry | 2 |
| Compressors | 1 |
| Drilling | 3 |
| Electric machinery | 1 |
| General | 1 |
| Metallurgy | 3 |
| Mining | 1 |
| Oil / petroleum | 5 |
| Refrigeration | 3 |
| Technology | 31 |
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