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Mine Rescue Statements of Fact - Test No. 4
Questions taken from the 2016 Coal Mine Rescue Statements of Fact - Group B


Progress Indicator:
Question 1 of 20

1.  In order to maintain a(n) __________, one door of the airlock must be kept closed while the other is opened.  (Statement No. 61)

Choices:
  1. seal
  2. airlock
  3. regulator
  4. overcast