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segnale di avvertimento; trasmissione in diretta; segnale luminoso |
on the air : 56 phrases in 13 subjects |
Antennas and waveguides | 1 |
Astronautics | 1 |
Communications | 2 |
Electronics | 1 |
Environment | 15 |
Finances | 1 |
General | 4 |
Law | 1 |
Measuring instruments | 1 |
Metallurgy | 1 |
Politics | 6 |
Social science | 1 |
Transport | 21 |