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What percentage of CO will produce discomfort in 2-3 hours? a) 5% b) 10% c) 15% d) 20%

What percentage of CO will produce discomfort in 2-3 hours? a) 5% b) 10% c) 15% d) 20%
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What percentage of CO will produce discomfort in 2-3 hours? a) 5% b) 10% c) 15% d) 20%

User TFS
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10% is your answer Explanation I just looked it up.
User Jrullmann
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