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| 四电子管的 | |||
| 四气门每缸的 | |||
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four -valve : 28 phrases in 9 subjects |
| Automobiles | 11 |
| Aviation | 1 |
| Chemistry | 1 |
| Compressors | 1 |
| Drilling | 1 |
| Electronics | 2 |
| Metallurgy | 2 |
| Refrigeration | 1 |
| Technology | 8 |
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