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| 发动机平行顶置式气门 | |||
| parallel valve: 13 phrases in 7 subjects |
| Automobiles | 3 |
| Compressors | 1 |
| Electronics | 2 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Technology | 4 |
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