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দুধের বিশুদ্ধতা? ঘনত্ব পরিমাপের যন্ত্র-

  1. A এ্যানিমোমিটার
  2. B ব্যারোমিটার
  3. C ল্যাক্টোমিটার
  4. D হাইড্রোমিটার
Answer: C - ল্যাক্টোমিটার

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