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| electron concentration; electron density | |||
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| concentration of electrons; density of electrons; electron density | |||
| ionization | |||
| densita elettronica: 10 phrases in 6 subjects |
| Antennas and waveguides | 1 |
| Astronomy | 2 |
| Earth sciences | 1 |
| Electronics | 2 |
| Medical | 2 |
| Radio | 2 |