Analog Electronics
When a reverse bias is applied to a diode, it will

  lower the potential barrier.
  increases the majority carrier an electric current greatly.
  none of these.
  raise the potential barrier.

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Analog Electronics
The typical input stage of an opamp has a

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

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