Power Systems
A sodium graphite reactors use

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

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Power Systems
An hydro-graph indicates

 the maximum and minimum run off during the period.
All of these
 the average run off during the period.
 the discharge at any time during the period under consideration.

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