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| 螺纹旋转方向 | |||
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thread hand : 41 phrases in 15 subjects |
| Architecture | 1 |
| Automobiles | 3 |
| Aviation | 1 |
| Chemistry | 1 |
| Compressors | 1 |
| Drilling | 3 |
| Electric machinery | 1 |
| General | 1 |
| Mechanic engineering | 1 |
| Mechanics | 3 |
| Oil / petroleum | 3 |
| Sealing | 1 |
| Space | 2 |
| Technology | 11 |
| Textile industry | 8 |