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92) How can we define the air content?

  1. a) Ratio of the volume of air voids to the total volume of the soil mass
  2. b) Ratio of the volume of air voids to volume of total voids in the soil mass
  3. c) Ratio of the volume of air voids to volume of water in the soil mass
  4. d) Ratio of the volume of voids to the total volume of the soil mass
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