Analog Electronics
The AC base voltage of an emitter follower is across the

 emitter diode.
 load resistor.
 DC emitter resistor.
  emitter diode and external AC emitter resistance.

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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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