Electric Circuits
The resistivity of semi-conductors at room temperatures is

 1.6 × 106 to 100 × 106 ohm - cm.
 1000 to 1500 ohm - cm.
 109 to 1012 ohm - cm.
 0.01 to 50 ohm - cm.

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Electric Circuits
Pure metal generally have

  low conductivity and zero temperature coefficient.
  low conductivity and high temperature coefficient.
  high conductivity and low temperature coefficient.
  high conductivity and large temperature coefficient.

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