Which one of the following is used in trickling filter?

অন্যান্য অন্যান্য 05 Oct, 2018

প্রশ্ন Which one of the following is used in trickling filter?

  • ক.
    filtration process
  • খ.
    biological action
  • গ.
    none of a or b
  • ঘ.
    both a and b

সঠিক উত্তর

both a and b

মন্তব্য

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