Analog Electronics
The common - mode rejection ratio is

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

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Analog Electronics
The typical input stage of an opamp has a

  single - ended input and differential output.
  single - ended input and single-ended output.
  differential input and single - ended output.
  differential input and differential output.

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