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1. সুপেয় পানিতে DO-এর মান কত? (What is the DO-level in drinking water?)

  • A. 6.5-8.0 ppm
  • B. 6.5-8.0 ppm
  • C. 6.5-8.0 ppm
  • D. 6.5-8.0 ppm

Answer: Option A

Explanation:

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