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作用阀 : 45 phrases in 9 subjects |
| Automobiles | 3 |
| Chemistry | 1 |
| Hydroelectric power stations | 1 |
| Nautical | 2 |
| Oil / petroleum | 5 |
| Rail transport | 12 |
| Refrigeration | 5 |
| Space | 1 |
| Technology | 15 |
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