Ответы на вопрос:
1. the non-conducting (а) material separating (б) the plates is called dielutric. 2. frequency-modulation presents an effective way of increasing (г) the signal-to-noise rate at the receiver. 3. we are always trying (в) to improve the quality of the transmitted signal. 4. flowing (б) through a conductor the alternating current reverses its direction at regular intervals.
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