densité de charge: 22 phrases in 11 subjects |
Analytical chemistry | 1 |
Antennas and waveguides | 1 |
Astronautics | 1 |
Chemistry | 1 |
Computers | 1 |
Crystallography | 2 |
Electronics | 7 |
Natural resourses and wildlife conservation | 1 |
Physics | 1 |
Radio | 2 |
Technology | 4 |