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题目材料:

According to the passage, an average geothermal gradient of 22℃ per kilometer of depth can be used to
  • Abalance the economics of HDR energy retrieval against that of underground hot water or steam recovery systems
  • Bdetermine the amount of energy that will be used for space heating in the United States
  • Cprovide comparisons between hot water and HDR energy sources in the United States
  • Drevise the estimates on the extent of remaining coal resources in the United States
  • Eestimate the total HDR resource base in the United States

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