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Inventions Exam Prep: Certification Test 706

helium Learning App & e-Book: MCQ 706

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MCQ: 706

The process to extract helium from natural gas was invented by

  1. Sir Henry Ruttan
  2. Sir John Cunningham McLennan
  3. Dr Larry wang
  4. Sir George Beers
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8th Class Science Test Questions

8th Class Science Quiz with Answers