Chains, Ropes, and Slings Test II
Source: Questions and answers from the National Safety Council


Progress Indicator:
Question 4 of 22

4.  Methane’s explosive range is 5 to 15 percent when there is at least ______ percent oxygen.

Choices:
  1. 1.21
  2. 12.1
  3. Either a or b
  4. None of the above


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