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Team Trainer Test No. 4
Taken from the 2016 Southeast Regional Team Trainer Contest held in Maysville, KY


Progress Indicator:
Question 1 of 30

1.  Oxides of nitrogen can occur in a mine atmosphere:

Choices:
  1. when certain explosives are used
  2. when diesel-powered equipment is being used
  3. when electric equipment produces arcs or sparks
  4. all of the above