| |||
| 螺旋板 | |||
|
spiral plate : 12 phrases in 7 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Compressors | 1 |
| Drilling | 1 |
| Laboratory equipment | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |
| |||
| 螺旋板 | |||
|
spiral plate : 12 phrases in 7 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Compressors | 1 |
| Drilling | 1 |
| Laboratory equipment | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |