frequency standard
of reference
| frequency standard abbr. | |
| el. | patrón de frecuencia |
| |||
| patrón de frecuencia | |||
|
frequency standard : 40 phrases in 6 subjects |
| Communications | 7 |
| Cultural studies | 2 |
| Electronics | 12 |
| Information technology | 2 |
| Radio | 1 |
| Technology | 16 |