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:
- seal
- airlock
- regulator
- overcast
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