Power Systems
If the breakdown voltage of the insulator is high, the thickness of the insulator is

None of these
 high
 less
 it does not related to breakdown voltage

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Power Systems
A sodium graphite reactors use

 sodium as moderator and graphite as coolant.
  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as moderator.
 a mixture of sodium and graphite as coolant.

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