Mine Rescue Field Exam
From the 2013 Ohio Valley Mine Rescue Contest, Cadiz, OH
Progress Indicator:
 
Question 8 of 10
8. Within what amount of time of being exposed to air can Class 4 Division 4.2 materials ignite? p. 116
Choices:
- 10 minutes
- 20 minutes
- 5 minutes
- 15 minutes
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