Statements of Fact Quiz IV
From the 2014 Revised Coal Mine Rescue Statements of Fact


Progress Indicator:
Question 1 of 25

1.  The range of concentrations within which a gas will explode is known as its __________________. (MSHA 3028, p. 2-7)

Choices:
  1. expensive range
  2. explosive range
  3. danger zone
  4. combustible range