Analog Electronics
A quartz crystal oscillator consists of

 only series resonant frequency.
 only parallel resonant frequency.
 neither series nor parallel frequency.
 both series and parallel frequencies.

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Analog Electronics
The typical input stage of an opamp has a

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

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