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

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

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Power Systems
Critical mass is

 none of these.
  minimum mass of fissionable material required to sustain chain reaction.
 a mass of fissionable material required to stop a chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.

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