Analog Electronics
A working diode must have

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

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Analog Electronics
The typical input stage of an opamp has a

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

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