Analog Electronics
The common - mode rejection ratio is

  equal to the common-mode voltage gain.
  very low.
  as high as possible.
  equal to the voltage gain.

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Analog Electronics
Optocouplers combine

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

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