 |
| frecuencia: 1868 phrases in 70 subjects |
| Agriculture | 5 |
| Antennas and waveguides | 26 |
| Astronautics | 1 |
| Automated equipment | 12 |
| Automatic control | 7 |
| Biotechnology | 1 |
| Chemistry | 4 |
| Communications | 484 |
| Computer numerical control | 9 |
| Demography | 1 |
| Earth sciences | 73 |
| Economy | 1 |
| Electric machinery | 3 |
| Electric motors | 4 |
| Electric traction | 3 |
| Electricity generation | 2 |
| Electronics | 561 |
| Energy industry | 3 |
| Environment | 2 |
| Finances | 2 |
| Fishery fishing industry | 1 |
| General | 14 |
| Genetics | 2 |
| Health care | 26 |
| Industry | 17 |
| Information technology | 111 |
| Labor law | 1 |
| Law | 1 |
| Life sciences | 15 |
| Lighting other than cinema | 1 |
| Magnetics | 8 |
| Materials science | 1 |
| Mathematics | 41 |
| Measuring instruments | 19 |
| Mechanic engineering | 9 |
| Medical | 35 |
| Metallurgy | 15 |
| Microsoft | 9 |
| Municipal planning | 1 |
| Natural sciences | 11 |
| Nuclear physics | 1 |
| Obsolete / dated | 1 |
| Packaging | 2 |
| Patents | 1 |
| Pharmacy and pharmacology | 3 |
| Physical sciences | 6 |
| Physics | 2 |
| Piezoelectric crystals | 35 |
| Politics | 1 |
| Power electronics | 1 |
| Power lines | 13 |
| Power system protection | 2 |
| Radio | 40 |
| Reliability | 12 |
| Satellite communications | 2 |
| Scientific | 1 |
| Semiconductors | 2 |
| Sound recording | 4 |
| Statistics | 96 |
| Technology | 31 |
| Telecommunications | 4 |
| Telegraphy | 6 |
| Telephony | 5 |
| Textile industry | 5 |
| Thermal Energy | 12 |
| Transport | 32 |
| Video recording | 1 |
| Water resources | 3 |
| Welding | 1 |
| Work flow | 1 |