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| |||
| pulse-frequency modulation; frequency modulation on the pulse | |||
| pulse frequency modulation | |||
| pulse frequency modulating; pulse repetition-rate modulation | |||
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脉冲频率调制 : 11 phrases in 4 subjects |
| Air defense | 3 |
| Electronics | 6 |
| Technology | 1 |
| Telecommunications | 1 |
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