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活塞平 衡 : 24 phrases in 11 subjects |
| Automobiles | 3 |
| Chemistry | 1 |
| Compressors | 2 |
| Drilling | 1 |
| Electronics | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 11 |
| Transport | 1 |
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