| |||
| variable frequency | |||
|
frequence variable : 19 phrases in 12 subjects |
| Automated equipment | 3 |
| Communications | 1 |
| Computers | 2 |
| Construction | 1 |
| Earth sciences | 3 |
| Electric motors | 1 |
| Electric traction | 1 |
| Electronics | 2 |
| Mechanic engineering | 1 |
| Power electronics | 1 |
| Statistics | 2 |
| Transport | 1 |