Mine Rescue Statements of Fact - Test No. 1
Questions taken from the 2016 Coal Mine Rescue Statements of Fact - Group A
Progress Indicator:
 
Question 8 of 20
8. Approximately how much longer than the positive pressure phase of an explosion last than the negative pressure phase? p. 320
Choices:
- Two times
- Four times
- Five times
- Three times
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