Analog Electronics
If the current gain is unknown in an emitter-biased circuit, you cannot calculate the

 collector current.
  base current.
 emitter voltage.
 emitter current.

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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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