Coal Mine Rescue Test 2
Taken from the 2015 Kentucky River Mine Rescue Contest in Hazard, KY

Progress Indicator:
Question 1 of 20

1.  ____________ is an asphyxiant in above normal concentrations.  (MSHA 3028, pp. 2-17)

  1. Hydrogen
  2. Nitrogen
  3. Methane

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