 |
| |||
| casing wall | |||
| shell wall | |||
| 壳壁: 21 phrases in 8 subjects |
| Aviation | 2 |
| Electronics | 4 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 7 |
|
| |||
| casing wall | |||
| shell wall | |||
| 壳壁: 21 phrases in 8 subjects |
| Aviation | 2 |
| Electronics | 4 |
| Hydroelectric power stations | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 7 |