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| frequency modulation index; FM index | |||
| warble rate | |||
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调频度 : 21 phrases in 9 subjects |
| Air defense | 5 |
| Communications | 1 |
| Earth sciences | 1 |
| Electronics | 4 |
| Oil / petroleum | 1 |
| Piezoelectric crystals | 1 |
| Refrigeration | 1 |
| Space | 5 |
| Technology | 2 |
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