Power Systems
A moderator material should have

 large atomic mass.
None of these
 may be any of the above.
  small atomic mass.

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Power Systems
A sodium graphite reactors use

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

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