Power Systems
An hydro-graph indicates

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

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Power Systems
A CANDU reactor uses

  natural uranium as fuel and heavy water as moderator and coolant.
 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.

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