Power Systems
A CANDU reactor uses

 enriched uranium as fuel and ordinary water as moderator and cooler.
 only fertile materials.
 highly enriched uranium as fuel and water as moderator and coolant.
  natural uranium as fuel and heavy water as moderator and coolant.

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Power Systems
An hydro-graph indicates

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

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