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Q: Fly-ash is a by-product of: फ्लाई-ऐश एक उप-उत्पाद है:
  • A. pig iron/कच्चा लोहा
  • B. coal/कोयला
  • C. gypsum/जिप्सम
  • D. lime/चूना
Correct Answer: Option B -
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Explanations:

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