 |
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| 活门绳; 阀线 | |||
| valve line: 49 phrases in 14 subjects |
| Automobiles | 5 |
| Aviation | 4 |
| Compressors | 1 |
| Drilling | 1 |
| Engineering geology | 2 |
| General | 1 |
| Mechanics | 2 |
| Metallurgy | 3 |
| Nautical | 2 |
| Oil / petroleum | 12 |
| Oil processing plants | 1 |
| Refrigeration | 3 |
| Technology | 11 |
| Water resources | 1 |