 zaventerharut 
                                                23.11.2019 14:06
                                                
                                                zaventerharut 
                                                23.11.2019 14:06
                                             utyak717 
                                                23.11.2019 14:15
                                                
                                                utyak717 
                                                23.11.2019 14:15
                                             НЕВЕСОМАЯ67 
                                                23.11.2019 14:16
                                                
                                                НЕВЕСОМАЯ67 
                                                23.11.2019 14:16
                                             alinakozina879 
                                                23.11.2019 14:25
                                                
                                                alinakozina879 
                                                23.11.2019 14:25
                                             Колегичева2005 
                                                23.11.2019 14:26
                                                
                                                Колегичева2005 
                                                23.11.2019 14:26
                                             эмили40 
                                                23.11.2019 14:28
                                                
                                                эмили40 
                                                23.11.2019 14:28
                                             20071210 
                                                04.02.2021 19:55
                                                
                                                20071210 
                                                04.02.2021 19:55
                                             larisavenzel 
                                                04.02.2021 19:53
                                                
                                                larisavenzel 
                                                04.02.2021 19:53
                                             яналапа 
                                                18.08.2019 07:50
                                                
                                                яналапа 
                                                18.08.2019 07:50
                                            
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.