 |
| |||
| Normalfrequenz f | |||
| Eichfrequenz f | |||
|
calibration frequency : 6 phrases in 3 subjects |
| Electronics | 4 |
| Optics branch of physics | 1 |
| Transport | 1 |
The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Add | The server is undergoing maintenance and the site is working in read-only mode. Please check back later.">Report an error
| Get short URL | Language Selection Tips