Power Systems
The commercial sources of energy are

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

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Power Systems
Gas coolled reactor

 use CO2. or helium as coolant and graphite the moderator.
 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.
 use heavy water as coolant as well as moderator.
  both B and C.

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