Rapid sand filter এ filtration rate

Rapid sand filter এ filtration rate

  1. ক) কম
  2. খ) বেশি
  3. গ) শূন্য
  4. ঘ) মাঝারি

From the LGED Sub-Assistant Engineer (Civil) November 2026 – Preliminary (BPSC) exam, question 60 of 100.

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