Analog Electronics
The typical input stage of an opamp has a

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

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Analog Electronics
When a transistor is connected in common emitter mode, it with have

High input resistance and low output resistance
Low input resistance as well as output resistance
Medium input resistance and high output resistance
Negligible input resistance and high output resistance

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