1.
Frequencies ranging from 300 to 3000 kilohertz are referred to as medium radio
frequencies.
а) Participle I в функции определения
2. The
alternating (а) Participle I в функции определения )current passes through a winding on a permanent magnet, causing (б) Participle I в функции обстоятельства) the
magnetic field.
3. The
seven digits are transmitted to the exchange by appropriate dialing.
г) герундий
4. At the
moment we are using a modem linked up direct to our computer and the telephone
line.
в) Participle I в составе временной группы Continuous