Analog Electronics
The voltage gain of a loaded differential amp is

  smaller than the unloaded voltage gain.
  impossible to determine.
  equal to RC / re.
  large than the unloaded voltage gain.

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

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

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