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Frequência : 1909 phrases in 68 subjects |
| Agriculture | 4 |
| Antennas and waveguides | 3 |
| Astronautics | 2 |
| Automatic control | 3 |
| Banking | 1 |
| Canada | 3 |
| Chemistry | 4 |
| Communications | 485 |
| Cultural studies | 2 |
| Earth sciences | 73 |
| Economy | 2 |
| Education | 4 |
| Electric machinery | 4 |
| Electric motors | 4 |
| Electric traction | 2 |
| Electrical engineering | 1 |
| Electricity generation | 3 |
| Electronics | 676 |
| Energy industry | 5 |
| Environment | 3 |
| Finances | 5 |
| General | 15 |
| Health care | 19 |
| Industry | 18 |
| Information technology | 139 |
| Insurance | 2 |
| Labor law | 2 |
| Law | 2 |
| Life sciences | 19 |
| Lighting other than cinema | 2 |
| Magnetics | 9 |
| Materials science | 2 |
| Mathematics | 33 |
| Mechanic engineering | 11 |
| Medical | 33 |
| Metallurgy | 17 |
| Microsoft | 8 |
| Natural sciences | 16 |
| Obsolete / dated | 1 |
| Patents | 1 |
| Pharmacy and pharmacology | 4 |
| Physical sciences | 9 |
| Physics | 1 |
| Piezoelectric crystals | 32 |
| Power electronics | 1 |
| Power lines | 9 |
| Power system protection | 2 |
| Radio | 38 |
| Radiobiology | 1 |
| Radiology | 2 |
| Reliability | 4 |
| Satellite communications | 3 |
| Scientific | 2 |
| Semiconductors | 4 |
| Social science | 1 |
| Sound recording | 4 |
| Statistics | 58 |
| Technology | 37 |
| Telecommunications | 6 |
| Telegraphy | 4 |
| Telephony | 4 |
| Thermal Energy | 7 |
| Transformers | 1 |
| Transport | 31 |
| Vacuum tubes | 3 |
| Video recording | 1 |
| Welding | 1 |
| Work flow | 1 |
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