 |
| |||
| 平均厚度 | |||
| average thickness: 14 phrases in 5 subjects |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Mining | 2 |
| Oil / petroleum | 1 |
| Technology | 9 |
|
| |||
| 平均厚度 | |||
| average thickness: 14 phrases in 5 subjects |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Mining | 2 |
| Oil / petroleum | 1 |
| Technology | 9 |