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| free running frequency | |||
| free-running frequency | |||
| natural frequency | |||
| free frequency | |||
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| natural frequency | |||
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| free frequency | |||
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| free running frequency | |||
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| free running frequency | |||
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| natural frequency | |||
| 自 然频率: 22 phrases in 11 subjects |
| Aviation | 4 |
| Communications | 1 |
| Electric machinery | 3 |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 4 |
| Space | 1 |
| Technology | 3 |
| Telecommunications | 1 |
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