Analog Electronics
A quartz crystal oscillator consists of

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

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the reverse direction to the emitter junction with collector open.
  in the reverse direction to the collector junction with emitter open.
  in the forward direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.

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