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The explosive range of methane is 5% to 15% by volume in air. This means a vapor/air mixture of __________.
A) 3 percent methane by volume is too rich to burn
B) 5 percent methane by volume will give a reading of 100 percent L.E.L. on a combustible gas indicator
C) 10 percent methane by volume is too rich to burn
D) 20 percent methane by volume is too lean to burn
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