Power Systems
In hydroelectric power plants

  operating cost is low and initial cost is high.
 both operating and initial cost are low.
 operating cost is high and initial cost is low.
 both operating and initial cost are high.

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Power Systems
A sodium graphite reactors use

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

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