Analog Electronics
The base of an npn transistor is thin and

 doped by a pentavalent material.
 metallic.
 heavily doped.
  lightly doped.

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Analog Electronics
A working diode must have

 Low resistance when forward or reverse biased
 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward or reverse biased
 High resistance when forward biased, while low resistance when reverse bias

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