Power Systems
The commercial sources of energy are

  fossile fuels and radioactive substances.
 solar, wind, biomass.
 none of above.
 wood, animal wastes and agricultural wastes.

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Power Systems
In a pressurized water reactor

  both B and C.
 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.
 the coolant water boils in the reactor core.

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