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octave frequency band | |||
octave band | |||
ortave band | |||
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octave band | |||
octave-band | |||
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octave band |
倍频带 : 30 phrases in 10 subjects |
Air defense | 3 |
Automobiles | 2 |
Electronics | 6 |
Geophysics | 2 |
Metallurgy | 1 |
Nautical | 1 |
Otorhinolaryngology | 1 |
Rail transport | 2 |
Refrigeration | 1 |
Technology | 11 |