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1.  ঢালাই লৌহ কার্বনের পরিমাণ কত?

  • A. 2.0 -4.5%
  • B. 2.0 -4.5%
  • C. 2.0 -4.5%
  • D. 2.0 -4.5%

Answer: Option A

Explanation:

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