Power Systems
Non-commercial sources of energy are

None of these
 solar, wind and biomass.
  wood, animal wastes and agricultural wastes.
 fossil fuel, hydro power and nuclear power.

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Power Systems
In a pressurized water reactor

 water is used at high pressure so that it is available is liquid from at about 280° C.
 heavy water is used as both coolant and moderator.
  both B and C.
 the coolant water boils in the reactor core.

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