Analog Electronics
The common - mode rejection ratio is

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

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Analog Electronics
A working diode must have

 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 Low resistance when forward or reverse biased

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