Analog Electronics
With both bases grounded, the only offset that produces an error is the

  input bias current.
  input offset current.
  β.
  input offset voltage.

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

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

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