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কি মাপার জন্য হাইড্রোমিটার (hydrometer) যন্ত্রটি ব্যবহার করা হয়?

  1. A আর্দ্রতা
  2. B ঘনত্ব
  3. C চাপ
  4. D তাপমাত্রা
Answer: B - ঘনত্ব

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