Analog Electronics
A quartz crystal oscillator consists of

 only parallel resonant frequency.
 neither series nor parallel frequency.
 only series resonant frequency.
 both series and parallel frequencies.

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Analog Electronics
Optocouplers combine

 IGBTs and MOSFETs.
  Infrared light emitting diode and a silicon photo transistor.
 Power transistor and silicon transistor.
 SITs and BJTs.

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