thread root
| diameter
| thread root | |
| auto. | 螺纹牙底 |
| oil | 螺根 |
| diameter | |
| avia. | 光学镜头的放大倍数 |
| earth.sc. | 粒径 |
| econ. | 透镜放大的倍数 |
| econ. од. | 径 |
| met. | 对径; 径; 倍 |
| space | 横截面 |
| tech. | 透镜放大倍数 |
| tech. од. | 直径 |
| |||
| 螺纹牙底根部 | |||
| 螺根 | |||
| 螺纹牙底; 螺纹根 | |||
|
thread root : 9 phrases in 4 subjects |
| Compressors | 1 |
| Oil / petroleum | 3 |
| Plastics | 1 |
| Technology | 4 |