|
internal element : 13 phrases in 11 subjects |
| Analytical chemistry | 1 |
| Artillery | 1 |
| Automated equipment | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| Mathematics | 1 |
| Nuclear and fusion power | 1 |
| Oil and gas technology | 1 |
| Spectroscopy | 2 |
| Telecommunications | 2 |
| Weapons and gunsmithing | 1 |