Analog Electronics
The load voltage is approximately constant when a zener diode is

  operating in breakdown region.
  unbiased.
  forward biased.
  reverse biased.

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Analog Electronics
The typical input stage of an opamp has a

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

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